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Maternal Self-Efficacy Buffers the Effects of COVID-19–Related Experiences on Postpartum Parenting Stress

Objective To examine the associations of maternal self-efficacy (MSE) and perceived social support with parenting stress during the postpartum period during the COVID-19 pandemic and whether these two psychosocial factors account for variance in parenting stress in addition to the effects of COVID-19–related experiences and sociodemographic factors. Design Cross-sectional survey. Setting Online survey, the Perinatal Experiences and COVID-19 Effects (PEACE) study, launched in May 2020. Participants Participants included 310 women who gave birth in the past 24 weeks. Methods The survey included self-report quantitative measures of MSE, social support, COVID-19–related experiences, parenting stress, symptoms of depression and anxiety, and a range of sociodemographic factors. Results Hierarchical multiple regression analysis indicated that MSE and social support were negatively associated with postpartum parenting stress in addition to the effects of COVID-19–related experiences, maternal symptoms of depression and anxiety, and a range of demographic factors. Furthermore, MSE interacted with COVID-19–related experiences such that higher levels of MSE mitigated the effects of COVID-19–related experiences on parenting stress. Conclusion Our findings underscore the importance of protective factors at the individual and interpersonal levels and provide insights for prevention and intervention programs aimed at mitigating postpartum parenting stress during a wide-scale disaster such as the COVID-19 pandemic.

T he postpartum period entails significant physical, psychological, and social adjustments for women as they transition from pregnancy and childbirth to motherhood (American College of Obstetricians and Gynecologists [ACOG], 2018) and for newborns as they transition from intrauterine to extrauterine life (ACOG, 2018;Lieberman et al., 2020;Morton & Brodsky, 2016;Verbiest et al., 2017). The postpartum period (defined in this study as the first 6 months after childbirth; E. S. Miller et al., 2013) can set a positive trajectory for maternal and infant health and the parent-infant relationship (ACOG, 2018;Lieberman et al., 2020). However, several factors, such as symptoms of depression and anxiety and high levels of stress, can impair maternal caregiving (Bernard et al., 2018;Luisa et al., 2019;Thomason et al., 2014;van der Zee-van den Berg, et al., 2021) and are related to negative child health and developmental outcomes (Kingston et al., 2018;Oyetunji & Chandra, 2020;Shapiro et al., 2020;Slomian et al., 2019).
The specific stressors and challenges resulting from the COVID-19 pandemic (Brown et al., 2020) are concerning for women who give birth during this period (Brooks et al., 2020;Harville et al., 2021;Horney et al., 2012). Indeed, recent cross-sectional surveys showed greater rates of symptoms of anxiety and depression in women who were pregnant or caring for young infants during the pandemic (Davenport et al., 2020;Saccone et al., 2020;Spinola et al., 2020). For example, in a sample of 524 primarily White, urban, well-educated women in the United States during pregnancy and the postpartum period, Kinser et al. (2021) found that predictors of symptoms of depression, anxiety, and stress included job and financial insecurity; worries about the health and well-being of self, infant, and family members; concerns about access to food and other supplies; and resiliency and adaptability.
Although it is reasonable to expect that the psychological toll experienced by pregnant women and those who begin to parent during the pandemic may increase parenting stress and negatively affect the ability to care for the infant, the effects of the COVID-19 pandemic on parenting stress and caregiving during the postpartum period have not been explored sufficiently. Parenting stress, originally defined by Abidin (1995) as the perceived discrepancy between parenting demands and the parent's ability and resources available to meet those demands, is associated with myriad parent and child outcomes, including child-parent attachment, child behavior problems, depression and anxiety in parents, and child maltreatment (Abidin, 1995(Abidin, , 2012. Two psychosocial factors, the availability of social support (Milgrom et al., 2019) and maternal self-efficacy (MSE) for parenting (Razurel et al., 2017), can buffer symptoms of depression, anxiety, and parenting stress in the early postpartum period and are worth investigation, given the potential importance of support for women during the postpartum period in the context of a global pandemic.
Social support is broadly defined as actual or perceived support received from within one's social network and includes tangible support (e.g., instrumental or informational support), emotional support (e.g., receiving empathy, affection, or caring), belonging support (e.g., having companionship and others available for socialization; Kent de Grey et al., 2018), and support from professionals (Corrigan et al., 2015). Social support can be a protective factor against perinatal depression and anxiety and enhance maternal well-being in the postpartum period (De Sousa Machado et al., 2020;Milgrom et al., 2019;Negron et al., 2013;Razurel et al., 2013). Findings of preliminary studies suggested that loss of social support resulting from the COVID-19 pandemic, including the anticipated support of family and friends and the loss of other community support resources, significantly increased stress for women during the postpartum period (DeYoung & Mangum, 2021;Kinser et al., 2021;Molgora & Accordini, 2020). In a cross-sectional sample of 524 Italian women, Spinola et al. (2020) found that low social support, loss of financial support, avoidant coping strategies, the amount of time spent in isolation, and a woman's mental health history were associated with high levels of perceived stress and symptoms of perinatal depression. In contrast, Dib et al. (2020) found more optimal coping among 1,329 mothers in the United Kingdom who received peer, instrumental, and family support during the COVID-19 lockdown.
Perceived self-efficacy, as defined by Bandura (1982), refers to "one's own judgments of how well one can execute courses of action required to deal with prospective situations" (p. 122) and often reflects one's effort and persistence when facing obstacles or adverse experiences. These self-perceived judgements can affect one's ability to perform specific tasks competently and effectively; negative perceptions have the potential to create stress and affect performance. Perceived self-efficacy is situation specific. Maternal selfefficacy is considered a domain of parenting self-efficacy (knowledge and confidence in performing parenting tasks; Law et al., 2019;Troutman et al., 2012) that specifically addresses perceived efficacy in infant caregiving tasks (Teti & Gelfand, 1991). Maternal self-efficacy refers to an individual psychological factor that affects the parenting experience. Maternal self-efficacy in the postpartum period is inversely related to symptoms of depression, stress, and anxiety (Razurel et al., 2017) and is positively related to perceptions of the infant (Leahy-Warren et al., 2012;Troutman et al., 2012) and attunement to the infant's signals and needs (Bolten et al., 2012;Fulton et al., 2012). With a small sample (N ¼ 53), Xue et al. (2021) examined parenting self-efficacy and quality of life of new mothers during the COVID-19 pandemic lockdown in Switzerland. Compared to a group of parents (N ¼ 58) who completed the measures before and after lockdown, mothers of newborns during the lockdown reported lowered parenting self-efficacy. Given the potential of psychosocial factors to mitigate stress during the postpartum period at the individual and interpersonal levels, it is important to understand how psychosocial factors interact with the additional pandemic stressors. The findings may inform prevention and intervention strategies to help women care for their newborns amidst significant personal and community disruption in the postpartum period. The objective of this study was to examine the associations of MSE and perceived social support with parenting stress during the postpartum period and the pandemic, as well as whether the two psychosocial factors account for variance in parenting stress in addition to the effects of COVID-19-related experiences and sociodemographic factors.

Design
We conducted a cross-sectional study using data derived from Wave 1 of the Perinatal Experiences and COVID-19 Effects (PEACE) study, an online survey study (N ¼ 1,912) in which respondents completed a self-report questionnaire regarding the potential effects of the COVID-19 pandemic on women during pregnancy and the postpartum period. The institutional review boards of Mass General Brigham approved all data collection and analysis procedures before initiation of the study.

Setting
Potential participants learned about the survey via e-mail distribution lists, social media, and word of mouth between May 19, 2020, and August 17, 2020. The participants responded to the survey on the online survey platform REDCap.  Note. Data were collected between May 21 and August 17, 2020.
Maternal Self-Efficacy Buffers the Effects of COVID-19-Related Experiences on Postpartum Parenting Stress Participants Eligible participants were female, ages 18 years or older, residing in the United States, and at least 13 weeks pregnant or had given birth less than 6 months before enrollment. Participants consented to participate in the study before they responded to the online survey.

Measures
We describe three categories of variables: predictors, outcomes, and covariates; definitions of constructs are fully detailed in Table 1.
Predictors. Maternal self-efficacy. We assessed MSE using a 10-item measure, the Maternal Self-Efficacy Scale (MSES; Teti & Gelfand, 1991). This measure is used to assess a woman's perception of her competencies about discrete parenting tasks. Using a 4-point Likert response format, from 1 (not good at all/I don't understand my baby at all) to 4 (very good/I understand my baby almost all of the time), participants selfreported their abilities across a variety of parenting tasks and skills. The total score corresponds to the sum of the scores of the answered items, and higher scores reflect higher levels of MSE. The total score ranges from 4 to 40. According to Teti and Gelfand (1991), the MSES showed an internal consistency reliability of .91. The Cronbach's alpha coefficient for the MSES in our study was .84.
Social support. We measured perception of social support using a 12-item scale, the Multidimensional Scale of Perceived Social Support (MSPSS; Zimet et al., 1988). Using a 7-point scale ranging from 1 (very strongly disagree) to 7 (very strongly agree), participants respond to such statements as "I have friends with whom I can share my joys and sorrows" and "My family really tries to help me." The total score corresponds to the sum of the scores of each answered item. The total score ranges from 12 to 84, and higher scores correspond to greater levels of perceived social support. Zimet et al. (1988) reported a Cronbach's alpha coefficient estimate of internal consistency reliability of .88 and a test-retest reliability coefficient of .85. The Cronbach's alpha for MSPSS in our study was .93.
COVID-19-related experiences. We examined four aspects of common and new unexpected experiences brought about by the pandemic using measures described as follows. The four aspects included worries about being infected with COVID-19 (health worry), worries about the infection likely causing morbidity or mortality (risk worry), worries about access to resources for basic needs and health care (resource worry), and feelings of grief due to missed life experiences during the pandemic (grief). We measured each aspect with items using a 5-point Likert scale. To map a more general landscape of the COVID-19 pandemicrelated challenges, we created a composite index by summing the scores of the four aspects of COVID-19-related experiences.
First, we assessed participants' COVID-19related health worry using four items from the Coronavirus Health Impact Survey (Merikangas et al., 2020). This measure is used to evaluate the intensity of worries related to COVID-19 that affect the health of the respondent and the health of the respondent's family and friends. Using a 5point range from 1 (not at all) to 5 (extremely), participants could indicate their degree of worry    Third, we assessed participants' COVID-19related resource worry using a 10-item measure that we created. This measure evaluates the  intensity of worries related to accessing and obtaining general resources during the COVID-19 pandemic. Using a 5-point range from 1 (not at all worried) to 5 (very worried), participants indicated their degree of concern regarding access to health care, groceries, employment, and other necessities. Summed response scores ranged from 10 to 50, and higher scores indicated higher levels of resource worry. The Cronbach's alpha coefficient was .81 for our study.
Finally, we assessed participants' feelings of grief due to missed experiences during the COVID-19 pandemic using a seven-item scale on which participants responded from 1 (strongly disagree) to 5 (strongly agree). Three of the component items were adapted from the Inventory of Complicated Grief (Prigerson et al., 1995), including "I feel stunned or dazed over what happened," "I feel that life is empty," and 'I feel bitter that COVID-19 caused me to experience loss in my routines and activities." Other items in this measure were used to assess participants' emotions regarding the cancellation and deferral of experiences because of the COVID-19 pandemic, including absence of celebrations for major life events and loss of support from family and friends because of social distancing. One item on the measure was specific to the perinatal period and assessed sadness about limitations on the ability to celebrate their pregnancy or birth with loved ones. Summed scores of responses range from 7 to 35, and higher scores indicate higher levels of grief. The Cronbach's alpha coefficient for this measure was .79 in our study.
Finally, to provide an overall depiction of COVID-19-related experiences, we created an index score by summing the scores of the four aspects of COVID-19-related experiences, including health worry, risk worry, resource worry, and grief. The summed score ranged from 25 to 125, and higher scores indicated greater overall negative effects of COVID-19-related experiences. We calculated a Cronbach's alpha coefficient of .76 for the composite index score. It was this overall index score of COVID-19-related experiences that was used for the subsequent regression analysis.
Outcomes. Parenting Stress Index. We assessed participants' parenting-related stress using the Parenting Stress Index (PSI; Abidin, 2012). The PSI is a 36-item measure with item responses on a 5-point Likert scale from 1 (strongly agree) to 5 (strongly disagree). Items are designed to probe the extent to which the participant finds their child or the transition to parenthood difficult or not up to their expectations. Example questions include "I feel trapped by my responsibilities as a parent" and "My child's sleeping or eating schedule was much harder to establish than I expected." A total score is the sum of responses to all items and can range from 36 to 180; lower scores indicate higher levels of stress. Abidin (1995) reported an estimate of internal reliability of .91. The Cronbach's alpha coefficient for the PSI was .92 for our study.
Covariates. Depression symptoms. We assessed participants' symptoms of depression using the 20-item Center for Epidemiologic Studies-Depression instrument (CES-D; Radloff, 1977). The CES-D is used to evaluate selfreported frequency and severity of symptoms of depression over the previous week using a 4point frequency-of-experience range from 0 (rarely or none of the time, less than 1 day) to 3 (most or all of the time, 5-7 days). Items assess symptoms including feelings of self-worth, sleep, appetite, and motivation, among others. Total scores may range from 0 to 60, and higher scores indicate more frequent symptoms of depression. Reported estimates of internal consistency reliability ranged from Cronbach's alphas of .85 to .90 (Radloff, 1977). We computed a Cronbach's alpha coefficient for the CES-D of .90 for our study.
Anxiety symptoms. We assessed participants' symptoms of anxiety using a seven-item measure, the Generalized Anxiety Disorder Scale (GADS; Spitzer et al., 2006). The GADS is used to examine self-reported frequency of symptoms of anxiety over the previous 2 weeks using a 4-point range from 0 (not at all) to 3 (nearly every day). Total scores range from 0 to 21, and higher scores indicate a higher level of anxiety. Spitzer et al. (2006) reported an internal consistency reliability estimate of .92 and a test-retest reliability coefficient of .83. The Cronbach's alpha coefficient for the GADS was .92 in our study.
Pandemic duration. We defined pandemic duration as the length of time in days between the formal announcement of the COVID-19 pandemic in the United States (March 13, 2020) and the survey start date for the participant.

Maternal Self-Efficacy Buffers the Effects of COVID-19-Related Experiences on Postpartum Parenting Stress
Multiparity. We defined multiparity as giving birth previously to two or more viable fetuses.
NICU stay. We defined a NICU stay as a response of yes to the query "Did your baby have to stay in the NICU?" and included all levels of NICU stay (II-IV, as well as unknown).

Procedures
We recruited participants through social media, including the Facebook pages of the Brigham and Women's Hospital and community groups such as Boston Moms, the Mass General Brigham Rally (a hospital-based research study platform), and word of mouth. Participants read the consent form and consented to participate in the study before participating in the online survey. The survey took approximately 30 to 45 minutes to complete. We did not offer an incentive to participants. We used frequent attention checks and human verification to ensure data quality. Data inspection also included identifying missing responses and removing them from the data set.

Analysis
Initial descriptive analysis indicated that the variables were normally distributed, and predictors had acceptable levels of collinearity (variance inflation factor < 5). Beyond descriptive analyses on all variables, we calculated zero-order correlations among all variables, with significance set at p < .05. After standardizing all variables, we conducted hierarchical regression analysis to examine the joint associations of COVID-19related experiences and maternal psychosocial factors to postpartum parenting stress, in addition to the covariates (i.e., the sociodemographic variables and current mental health symptoms listed in Tables 2 and 3). Specifically, postpartum parenting stress was regressed on the covariates (Step 1), COVID-19-related experiences composite score (Step 2), and psychosocial factors (Step 3). We examined full-factorial interactions between the COVID-19 composite, MSE, and social support. We performed all analyses in the R statistical computing language and software environment, version 4.0.5 (R Core Team, 2020).

Results
Out of the entire sample of Wave 1 participants of the PEACE study, 310 women (M age ¼ 33.8 years, SD age ¼ 3.6) reported giving birth within the defined postpartum period and, thus, were included in the current study (see Table 2). Most participants were White and college educated; close to 50% of them had household incomes of at least $150,000 per year, and 98% cohabited with their partners. Among the infants (M age ¼ 18.1 weeks, SD age ¼ 6.4), 52% were female, approximately 60% were firstborn, and 99% were singletons. Approximately 11% of the infants required care in the NICU, and 8% were born before 37 weeks gestation. On average, respondents completed the survey approximately 128.3 (SD ¼ 32.4) days after the pandemic was declared a national emergency in the United States (March 13, 2020). Table 3 shows the descriptive statistics of maternal mental health symptoms (the CES-D and GADS), COVID-19-related experiences (health worry, risk worry, resource worry, and grief), psychosocial factors (the MSES and MSPSS), and postpartum parenting stress (the PSI). As shown in Table 4, the PSI; COVID-19related health worry, risk worry, resource worry, grief, and the composite score; psychosocial factors (the MSES and MSPSS); and mental health symptoms (the CES-D and GADS) were significantly correlated in the expected directions. Higher COVID-19-related experiences and CES-D and GADS scores were associated with higher PSI score. Higher MSPSS and MSES scores were associated with lower PSI score. None of the sociodemographic characteristics were correlated with PSI score.
We conducted a hierarchical regression analysis to examine the joint associations of COVID-19related experiences and psychosocial factors with PSI score, in addition to the covariates (i.e., the sociodemographic factors listed in Table 2 and the CES-D and GADS scores). As shown in Table 5, sociodemographic characteristics and CES-D and GADS scores entered in Step 1 of the model significantly predicted PSI score (F ¼ 5.19, p < .001, adjusted R 2 [R 2 adj ] ¼ 0.24), although none emerged as significant unique predictors of parenting stress. Inclusion of COVID-19-related experiences in Step 2 significantly (although with only small effect size) improved the model (F ¼ 5.41, p < .001, R 2 adj ¼ 0.26, DR 2 adj ¼ 0.02, p ¼ .00) and predicted PSI score in addition to all other variables. The inclusion of the two psychosocial factors, the MSPSS and MSE, in Step 3 also improved the model (F ¼ 12.1, p < .001, Data showed that maternal self-efficacy mitigated the effects of COVID-19-related experiences. We next examined full-factorial interactions among COVID-19-related experiences, MSE, and MSPSS score. There was a significant interaction between COVID-19-related experiences and MSE contributing to PSI score. All other interaction terms were nonsignificant. Thus, the final model included only one second-order term, that is, the cross-product of the composite of COVID-19-related experiences and the MSES (Step 4). The results showed that COVID-19related experiences positively predicted PSI score. Infant age and number of older children appeared to be positively associated with PSI score, while cohabiting relationships and MSPSS score showed negative associations. Score on the CES-D, but not on the GADS, was positively associated with the PSI. Notably, the MSES outweighed the MSPSS and COVID-19-related experiences for its unique association with PSI score, b ¼ -0.52, SE ¼ 0.06, t ¼ -8.17, p < .001. Furthermore, the inclusion of the interaction term (the cross-product of COVID-19-related experiences and the MSES) improved the model (F ¼ 12.2, p < .001, R 2 adj ¼ 0.52, DR 2 adj ¼ 0.01, p ¼ .04) and uniquely contributed to the explained variance in the PSI in addition to all other variables, b ¼ -0.10, SE ¼ 0.05, t ¼ -2.08, p ¼ .02. Figure 1 summarizes the subsequent simple slope tests of the interaction, showing the predictions of the PSI from low (-1 SD), mean, and high (þ1 SD) COVID-19-related experiences at each of the three levels of MSE (-1 SD, mean, and þ1 SD). Specifically, as MSE increased, the strength of the association between COVID-19related experiences and postpartum parenting stress decreased, revealing the buffer role of MSE in mitigating parenting stress.

Discussion
Our findings show elevated parenting stress during the COVID-19 pandemic among a group of women during the postpartum period. Considering the potential detrimental effects of maternal stress on women, infants, and the family (Liu & Doan, 2020;, it is important to capitalize on protective factors that mitigate the stress related to the birth of a newborn, especially during a challenging global pandemic (Kinser et al., 2021;. Furthermore, two psychosocial factors at the individual and interpersonal levels, MSE and social support, served as protective factors for women who experienced COVID-19-related parenting stress. We assessed four aspects of COVID-19-related experiences, including health worry, risk worry, resource worry, and grief. These experiences were new and unexpectedly brought about by the pandemic. Each of the four aspects of COVID-19-related experiences was positively correlated with postpartum parenting stress, which suggests the multidimensional nature of pandemic experiences. To map a more general landscape of pandemic-related challenges, we compiled the four aspects of COVID-19-related experiences into a composite index that showed a clear contribution to postpartum parenting stress in addition to a range of socioeconomic factors and maternal mental health symptoms. This finding corroborates reports from studies that show how the unprecedented COVID-19 pandemic has negatively affected already taxing and challenging parenting after birth (Fernandes et al., 2021b;Molgora & Accordini, 2020;Taubman-Ben-Ari et al., 2021).
Although maternal mental health symptoms were not the primary focus of this study and were treated as covariates in the regression models, symptoms of depression and anxiety showed zero-order correlations with postpartum parenting stress. Notably, after we accounted for all other variables, only symptoms of depression uniquely contributed to postpartum parenting stress, but symptoms of anxiety did not. The findings on maternal depression are consistent with prior research that showed a link between maternal depression and postpartum parenting stress (Crugnola et al., 2016;Epifanio et al., 2015;Thomason et al., 2014;Vismara et al., 2016). Maternal depression tends to be associated with low tolerance and heightened arousal in response to distress signals from the newborn and the general demands of parenting (Bocknek et al., 2012;Feldman et al., 2009), which makes it difficult for women to feel that they are measuring up to their expectations of being parents. Such discrepancies between the expectations of parenting and women's perceived abilities to meet those expectations is at the core of the notion of parenting stress (Abidin, 1995).
In contrast to depression, symptoms of anxiety did not show a clear and direct connection to parenting stress when all other variables were accounted for. Although symptoms of anxiety during the postpartum period have been Maternal Self-Efficacy Buffers the Effects of COVID-19-Related Experiences on Postpartum Parenting Stress associated with less sensitive responses to infants' cues and less optimal quality of parenting (Britton, 2011;Crugnola et al., 2016;Feldman et al., 1997;Nicol-Harper et al., 2007), some researchers did not find comparable effects of maternal anxiety on the quality of postpartum parenting when compared to symptoms of depression (Dubber et al., 2015;Edhborg et al., 2011;Tietz et al., 2014). Although further research may help more fully characterize the effects of maternal anxiety on postpartum parenting, the results of our study suggest that symptoms of depression and anxiety influence caregiving in different ways. Our findings warrant more attention to prioritizing symptoms of maternal depression when devising prevention and intervention strategies to reduce postpartum parenting stress in the context of a global pandemic.
Maternal self-efficacy and perceived social support uniquely accounted for the variance in postpartum parenting stress in addition to COVID-19-related experiences and other socioeconomic and maternal mental health covariates. Our findings underscore the important functions of the psychosocial correlates at the individual and interpersonal levels for postpartum parenting stress during the crisis of a pandemic. The main effect of perceived social support aligned with the well-documented buffering role of social support on maternal stress and adversity and the broad implications of social support and maternal well-being during the perinatal period (Barbosa-Leiker et al., 2021;Webster et al., 2011). Under nonpandemic conditions in the postpartum period, women can more easily access help through extended family, friends, childcare facilities, health care systems, and other community resources such as parenting support groups. However, amid the COVID-19 pandemic, social distancing, stay-at-home orders, and other prevention guidelines substantially changed social connections and limited women's access to otherwise available help and support (Saltzman et al., 2020;Szkody et al., 2020). As the findings of our study and those of others (Iztayeva, 2021;Miller et al., 2020) show, when the COVID-19 pandemic severely restricted other sources of social support, the cohabiting relationships with a spouse/partner were particularly beneficial to alleviate parenting stress. Increased time spent at home by a partner/ spouse (because of unemployment, reduced work hours, or working from home) and, thus, a general shift toward more equally divided childcare duties might help relieve maternal stress related to parenting (Carlson et al., 2021;Lyttelton et al., 2020). Our findings reinforce the important role that partners play in supporting the wellness of women during the postpartum period.
In times of limited sources of interpersonal support, it is also important to consider the mother's internal resources. The mother's sense of efficacy (Bandura, 1998;Bloomfield & Kendall, 2012) may effectively assuage the perceived stress of parenting during a pandemic. Our findings indeed underscore that MSE accounts for significant variance in parenting stress and that the unique variance accounted for by MSE outweighs social support and COVID-19-related experiences. Furthermore, our results suggest that MSE interacted with COVID-19-related experiences such that the negative effects of the pandemic on parenting stress significantly decreased as MSE increased. These findings support the notion that self-efficacy is a valuable resource within an individual that can maximize goal-directed outcomes during challenging circumstances (Hobfoll, 1989;Hobfoll et al., 2018). In other words, in the process of the mother's efforts to garner available resources to guard against the stress of parenting a newborn amid a pandemic, MSE, an inner psychocognitive resource, emerged as an effective means to manage parenting stress when the world outside appeared disrupted and unpredictable.

Limitations
Several limitations of this study warrant future investigation. First, we collected data using a cross-sectional design, and the analyses were correlational in nature; it is possible that the perception of parenting stress may worsen the perception of the negative effects of the pandemic, including symptoms of depression, and undermine the sense of efficacy in parenting. Wave 2 of the PEACE study holds promise to address this limitation because data obtained at different time points may shed light on the temporal relations between study variables and provide insights for possible causal relations. Second, the current sample, which was predominantly White, well educated, and well resourced, may not represent the experiences of women from other races/ethnicities or at different income or educational levels. Additionally, women who were more stressed by the pandemic may be more likely to respond to a survey about parenting stress. Thus, the findings are not generalizable to all women and Lin, H.-C. et al. their families across diverse backgrounds during the postpartum period. Given the increased risks of the COVID-19 infection in underserved populations in general (Gross et al., 2020) and the broad effects of the COVID-19 pandemic on maternal and perinatal health across a wide range of health, social, and economic concerns (Kotlar et al., 2021), it is essential that future researchers explore the support available to and useful for populations with fewer resources.
Although telehealth has been an effective way to provide remote maternity and postpartum services during the pandemic, lack of access to computers or smartphones, inadequate broadband Internet services, and language barriers are significant concerns (Hill & Burroughs, 2020) that can influence the ability of underresourced parents to participate in survey research. Community engagement methods, including involving community members in research design and implementation, individual and focus group interviews, and partnering with community resource and advocacy agencies are approaches more likely to yield data that more accurately reflect the needs of these communities (Burroughs et al., 2021). Finally, we did not include measures of infant temperament, which has been shown to be related to maternal mental health and perceived parenting stress (Fernandes et al., 2021a;Gray et al., 2013). Including infant temperament as a covariate would thus provide a better understanding of parenting stress during the postpartum period.

Implications
Despite these considerations, we documented postpartum parenting stress in the context of an unprecedented global pandemic and how psychosocial correlates at the individual and interpersonal levels, that is, MSE and social support, serve as protective factors. We showed that MSE buffers the negative effects of COVID-19-related experiences on parenting stress. These findings contribute to refining our understanding of the factors conferring risk for parenting stress during the first 6 months after childbirth. To support women in managing parenting stress during the postpartum period, it is important to assess the worries, concerns, and grief uniquely associated with the pandemic (Erdei & Liu, 2020;, to screen for possible symptoms of depression (Liu & Tronick, 2012, and to explore possible forms of social support as permitted by prevention regulations. Notably, interventions aimed at enhancing MSE are likely to be effective in managing parenting stress. Elements of such interventions include emphasizing that self-efficacy is a dynamic process that can be improved (Bandura, 1997), educating about what to expect in terms of infant developmental milestones (Ruchala & James, 1997), enhancing objective cognitive appraisal of their own competence in relation to the external situation, and fostering coping skills to increase the sense of mastery under challenging circumstances (Dekovi c et al., 2010;Freisthler et al., 2021;Sanders & Woolley, 2005).

Conclusion
COVID-19-related disruptions magnified the challenges and perceived stress in parenting a newborn. Our findings show that MSE and social support provide important psychosocial protection from COVID-19-related parenting stress at the individual and interpersonal levels in addition to COVID-19-related experiences, maternal mental health symptoms, and a range of sociodemographic factors. That MSE significantly buffers the negative effects of the COVID-19 pandemic on parenting stress underscores the importance of this inner resource of strength, particularly in times of decreased social support. Although limited in generalizability to women with fewer resources, the findings highlight a need to develop support and intervention models that enhance parenting self-efficacy as an individual source of strength for women in the postpartum period in the context of a global pandemic.

CONFLICT OF INTEREST
The authors report no conflicts of interest or relevant financial relationships. Enhancing maternal self-efficacy is important to mitigate the effects of a global pandemic for women in the postpartum period.
Maternal Self-Efficacy Buffers the Effects of COVID-19-Related Experiences on Postpartum Parenting Stress