Change in weight z-score from birth to discharge according to the Fenton growth chart, by proportion of enteral diet as human milk. A. Change in weight z-score by proportion of enteral intake as human milk, all subjects. B. Change in weight z-score by type of human milk diet among infants receiving >75% of enteral intake as human milk. MM = maternal milk; DM = donor human milk; Mixed MM/DM = diet contained >75% human milk, a mixture of both maternal and donor milk, neither of which comprised >75% of the diet.