[Adaption of protein in infant feeding]

A regarding its intestinal microecological action like human milk performed infant formula with a protein content of 1,6%, exclusively as casein, caused in nature born infants the same retention of nitrogen as human milk did. In prematures addition of cystine led to an increased retention. The serum level of urea and the pH of the feces were enhanced up to an undesirable degree when an analogous formula with 2,3% casein was applicated.