The study of the newborn child during its first month of life is properly a part of the obstetrician's duties, as the relationships of mother and child are so interdependent at that period that neither can be regarded apart from the other with wisdom or safety.
It is a gravely important epoch in the infant's life, covering as it does new processes for advance toward an independent existence when the mother will be no longer a source of direct nutrition.
The elaboration of the blood through direct oxidation by way of the respiratory tract, and the digestion of breast milk through the alimentary tract, are radical and abrupt changes which check the growth for a few days in most instances and in many eases for a much longer time. The duration of this check varies according to the promptness and thoroughness with which the new natural processes are accomplished by
DAVIS EV. THE QUANTITY AND QUALITY OF BREAST-MILK DURING THE FIRST TWO WEEKS OF THE PUERPERIUM. JAMA. 1908;LI(15):1209–1212. doi:10.1001/jama.1908.25410150013001c
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