The incidence of type 1 diabetes (T1D) in young children (age <5 years) is rising. The burden of responsibility for disease management rests on parents and caregivers to check blood sugar, administer insulin, and monitor diet and physical activity to maintain tight glycemic control. This occurs at a vulnerable time in life when children's behavior is unpredictable, their T1D is difficult to control, and parenting stress is elevated. Despite behavioral interventions that have demonstrated success in reducing rates of parent stress and improving child behavior, improvements in young children's glycemic control has not been sufficiently achieved. The investigators' research will attempt to achieve this goal through the development and pilot of an innovative behavioral intervention for T1D in parents of young children. The focus of the intervention is on improving young children's nutrition and physical activity through the use of parent consultants and delivery of intervention through phone and text messaging. The study will be conducted in two phases. In Phase 1, 10 primary caregivers of young children (<5 years) diagnosed with T1D for at least 6 months will receive the intervention and then be assessed at 3- and 6- months post baseline on indices of behavior and glycemic control (including continuous glucose monitoring). Participants will also complete in-depth surveys to provide qualitative as well as quantitative data. At the end of Phase 1, the data will be analyzed and used to develop the intervention further for Phase 2. During Phase 2, 60 participants and their children will be randomized to either the revised intervention (treatment) or usual care (control) condition. Intervention components include: T1D management support delivered by trained lay parent consultants, and T1D parenting strategies specific to improving eating and physical activity behaviors delivered by bachelor's level behavioral assistants via telephone and text messaging. Biomedical and psychosocial measurements (including HbA1c, physical activity, nutrition, mealtime behavior, parenting stress, quality of life) will occur at baseline and 3- and 6-months post baseline. The results of this work will ultimately lead to a program which can improve young children's T1D management and glycemic control that can be translated into a variety of clinical practice settings.