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Since the advent of the vacuum-jacketed bottle, one of the uses to which it has been put is that of keeping a supply of baby's milk warm over several feeding-periods. From the standpoint of convenience, the idea of adopting this procedure, especially for night feeding, is attractive, as the troublesome process of warming the milk to the proper nursing-temperature at each feeding is thereby eliminated. The usual procedure is simply to warm a suitable quantity of properly modified milk to a temperature somewhat above that required for feeding and place the heated mixture in a vacuum bottle, which is then tightly stoppered and set aside until needed. The milk remains warm enough for feeding over a very considerable period of time.
From a bacteriologic standpoint, it becomes evident on reflection that this practice may or may not be safe
for the infant, according to whether the milk is kept at
TONNEY FO, PILLINGER HH. THE UTILITY OF THE VACUUM BOTTLE IN INFANT-FEEDING. JAMA. 1912;LVIII(20):1495-1496. doi:10.1001/jama.1912.04260050171004