After a woman gives birth, she will often feel anxious, depressed, or upset. For most women, these feelings go away within a week of giving birth, but for some, postpartum depression (PPD) can develop. PPD involves long-term, more severe feelings of anxiety, depression, and despair that impair normal functioning. Untreated PPD threatens both the mental health of mothers and the development of their infants, but many cases go untreated. This may be because of the stigma of mental health treatment, limited availability of programs, cost of treatment, or difficulty finding the time to schedule trips out of the home. Treatment through a Web-based program addresses all these concerns by providing a private, cost-efficient program available anywhere with computer access. This study will develop and test a Web-based version of cognitive behavioral therapy (CBT) to treat women with PPD to determine its feasibility and acceptability.