CHOOSING A FORMULA
There are three classes of infants who require weak-milk mixtures to begin with: namely, the baby who has been previously nursed and whose mother's milk has utterly failed; the baby just weaned; and the infant whose power to digest is low. If these children were six months old, and the formula best suited to them is unknown, we must begin with a formula suited to a two- or three-month-old child and quickly work up to the six-month formula, which may often be accomplished within two or three days.