The study supplementation will be started at the when oral feeds will reach 24 mL/kg/day after surgery after collecting a stool/ostomy sample. The decision to start feeding will be made by the neonatal and surgical team. After the first stool/ostomy sample is obtained, one study sachet to a minimum of 1 mL of Expressed Breast Milk (EBM) (mothers own milk or donor human milk) once a day.