Symptoms of minor discomfort are seen for a day or two with many infants after an ordinary increase in food; but in most cases an infant soon becomes accustomed to the stronger food and is able to digest it. If, however, the symptoms of disturbance are marked, one should promptly go back to the weaker formula. The next increase should be a smaller one. _Should one be disturbed if for the first two or three weeks of artificial feeding the gain in weight is very slight or even if there is none?_ Not as a rule. If the infant does not lose weight, is perfectly comfortable, sleeps most of the time, and does not suffer from any symptoms of indigestion, such as colic, vomiting, etc., one may be sure that all is going well and that the infant is becoming used to his new food. As the child's appetite improves and his digestion is stronger, the food may be increased every few days and very soon the gain in weight will come and will then be continuous. If, however, the scales are watched too closely and, because there is only a slight gain in weight or none at all, the food is rapidly increased, an acute disturbance of digestion is pretty certain to follow. _Is not constipation likely to occur if the child is on a very weak food?_ It is very often seen and is due simply to the small amount of residue in the intestine. Under these circumstances, if the bowels move once every day, one should not be disturbed even when the movements are small and somewhat dry. As the food is gradually strengthened, this constipation soon passes off; while if injections, suppositories, or cathartics are used to produce freer movements, the functions of the bowels are likely to be disturbed. _Under what circumstances should the food be reduced?_ Whenever the child becomes ill from any cause whatever, or whenever any marked symptoms of indigestion arise. _How may this be done?_ If the disturbance is only a moderate one and the food has been made up for the day, one third may be poured off from the top of each bottle just before it is given, and this quantity of food replaced by the same amount of boiled water. If the disturbance is more severe, the food should be immediately diluted by at least one half and at the same time the quantity given should be reduced. For a severe acute attack of indigestion the regular food should be omitted altogether and only water given until the doctor has been called. _If the food has been reduced for a disturbance of digestion, how should one return to the original formula?_