Much work has been done by pediatricians and others in an effort to treat cow's milk so that it may be substituted more satisfactorily for breast milk. This work has been mainly in two fields.
The earlier efforts were aimed at raising the hydrogen ion concentration or reducing the buffering capacity. It is well known that digestion in the infant's stomach takes place at a pH of 3 to 5, as compared with a pH of about 2 in the adult. Owing to this fact it is important that the milk ingested have not too high a buffering value. Breast milk is ideal in this connection. Cow's milk and goat's milk, on the other hand, are comparatively resistant to a change in pH. As has been pointed out many times, the main factor contributing to this discrepancy is the presence of larger quantities of protein in these