The CanDo (Canadian Donor Milk) Trial

The goal of this clinical trial is to learn about the impact of donor milk vs formula supplementation on human milk feeding and the health outcomes of infants who require supplementation in well-baby units. It aims to explore whether supplementation with donor milk vs formula for infants during the initial hospital stay in a well-baby unit will increase both the exclusivity and duration of breastfeeding at 4 months. The Investigators will also explore whether the type of supplementation will positively affect measures of newborns' health, growth, behavior, feeding efficacy, and parental stress. Each participating infant born to a diabetic mother OR born small for his/her gestational age (\<2500 grams) OR late preterm (35 0/7-36 6/7 weeks of gestational age) is assigned at random to 2 groups. The groups are: 1) Donor milk: all babies in this group will receive pasteurized donor milk from a trusted milk bank. 2) Formula: all babies in this group will receive formula as a standard of care.