Eight normal full-term infants have been studied during ad libitum ingestion of a formula (Formula 1257) containing 60 calories/100 ml and providing 7% of the calories as protein from cow's milk, 50% from a mixture of vegetable oils and 43% from lactose. The mean concentration of nitrogen in this formula was slightly less than the mean concentration in human milk in a previous study.4Growth of the infants is interpreted as within normal limits.The mean concentration of urea nitrogen in the serum was 6.0 mg/100 ml. Between 1 and 6 months of age the mean concentration of total protein in the serum was 5.7 gm/100 ml.Both the mean volume of intake and the mean concentration of nitrogen in the feeding were slightly less than those of the infants fed pasteurized human milk. Consequently, in 44 of 60 metabolic balance studies with infants receiving Formula 1257, intakes of nitrogen were less than the mean intakes of infants of similar age receiving pasteurized human milk (Fig. 3). Similarly, retentions of nitrogen in 37 of the 60 metabolic balance studies fell below the regression calculated for infants fed pasteurized human milk (Fig. 4). The retentions of nitrogen were generally in the range of those of infants fed pasteurized human milk and it is concluded that the two feedings have similar abilities to promote retention of nitrogen by infants.
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