The practice of weaning the baby for trivial reasons has increased in the last decade, and can be laid largely at the door of the medical profession. For all practical purposes the only absolute indication for weaning the baby is open tuberculosis in the mother. For the last few years I have been making a systematic inquiry at the University Dispensary and Infant Welfare Stations as to reasons for weaning young infants; and in nine cases out of ten, the answer has been that “the milk gave out.” In only a very small proportion of cases has an ordinarily well-nourished mother insufficient milk; far oftener the fault lies with the child. Insufficient and late development of the sucking reflex prevents these infants from completely emptying the breast, which in time “dries up.” This period can be tided over by nursing from both breasts, by temporarily increasing the number of nursings, or temporarily employing “allaitement mixte.” In cases in which, after long, patient effort the supply of milk is still insufficient, either supplementary or complementary feeding of cow’s milk can be given. Where this mixed feeding is employed a minimum amount of cow’s milk should be given; and the opening in the nipple should be as small as possible, otherwise the child gets too much cow’s milk, and with too little effort, and gradually refuses the breast. Another excuse, and one fostered to some extent by physicians, is, that certain breast-milks are “poison for the baby.” This has even less foundation in fact; and here again the fault must be looked for in the baby rather than in the mother. Outside of certain variations in the fat-content, all breast-milks are alike in composition. In proof of this Finkelstein has fed these babies at the breast of tried wet-nurses with absolutely no benefit, while the children of the wet-nurses would thrive at the breast of the “poison-milk mother.” Abscess of both breasts may force a temporary cessation of nursing, but the breast should be regularly emptied until the inflammation has subsided; and then the nursing should be re-established. Cracked or sunken nipples may render nursing impossible, but they do not stop the flow of milk. In both these latter conditions the milk may be manually expressed or removed with the breast-pump. In this connection I wish to recommend the improved Jaschke pump, in which, by means of a releasing valve, the sucking movements of the child can be very closely imitated.