Cow's milk

Definition and stakes

E. E. Kellogg Science in the Kitchen

Cow's milk differs from human milk in that it contains nearly three times as much casein, but only two thirds as much fat and three fourths as much sugar. Cow's milk is usually slightly acid, while human milk is alkaline. The casein of cow's milk forms large, hard curds, while that of breast milk forms fine, soft curds. These facts make it important that some modification be made in cow's milk to render it acceptable to the feeble stomach of an infant. Cases are rare where it is safe to feed a child under nine months of age on pure, undiluted cow's milk.
Source: Gutenberg

Portrait of Isabella Beeton Isabella Beeton Mrs. Beeton's Book of Household Management (1907)

The breed of the cow has undergone great improvement in modern times as regards both the quantity and the quality of the milk which she affords. Although milk in its natural state is a fluid, yet, considered as an aliment, it is both solid and fluid; for no sooner does it enter the stomach than it is coagulated by the gastric juice, and separated into curds and whey, both of which are extremely nutritious. The milk of the human subject is much thinner than cow's milk; asses' milk comes the nearest to human milk of any other; goat's milk is somewhat thicker and richer than cow's milk
Source: Wikisource

Mary L. Read The mothercraft manual (1916)

If artificial feeding becomes necessary, clean cow’s milk is the best substitute. Cow’s milk is made for the calf, whose stomach and digestion are much coarser, and development much more rapid, than the baby’s. As produced, it contains too high a percentage of protein and lime, too low a percentage of sugar and phosphorus, and the curd is too large and coarse for the baby’s digestion. It is difficult to produce perfectly clean, and to keep perfectly sweet until feeding.
Source: Gutenberg

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