This is a domain of the Building Optimal Strategies to Enhance Parent and Infant Wellbeing in CHD (BOND) platform trail. BOND is a randomized, multifactorial, adaptive platform trial that seeks to optimize parent wellbeing and infant development following prenatal or neonatal diagnosis of congenital heart disease (CHD). The aim is to increase the proportion of infants with critical CHD who received direct breastfeeding at four months of age and to determine the impact of direct breastfeeding on maternal and infant health. Infants with congenital heart disease have lower rates of breastfeeding than the healthy population. Direct breastfeeding may be particularly beneficial in this population to reduce medical complications. In addition, direct breastfeeding may benefit maternal child bonding and enhance maternal mental health. Follow-up will continue through 12 months of infant age.