Human Milk for Congenital Gastrointestinal Disorders

Participants will receive an exclusive human milk diet comprised of mother's own milk (MOM, pasteurized donor human milk (DM) fortified with a donor-milk based fortifier (DMBF): Prolact+ for infants \<37 weeks PMA and/or or weight \<2,200g or PBCLN-002 for infants \>37 weeks PMA and/or weight \>2,200g)