There has been no lack of investigation of the gastric secretion of infants. Shortly after the stomach tube was devised by Kussmaul it was carried into the field of pediatrics, first for therapeutic measures and considerably later for physiologic studies. In spite of many years of varied work in this field, it must be admitted that we have not progressed far in our knowledge of the physiology of gastric digestion. Numerous causes may be assigned for this slow progress. One of the main obstacles to a scientific study of secretion — the phenomenon which interests us particularly at this time — has been and remains the fact that the acid juice rapidly enters into combination with the milk food, so that it becomes impossible to judge accurately of its quantity or of its quality. It is this variable factor which accounts for the wide discrepancies in the reports on this
HESS AF. THE GASTRIC SECRETION OF INFANTS AT BIRTH. Am J Dis Child. 1913;VI(4):264–276. doi:10.1001/archpedi.1913.04100340043004
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