Abstract
Morphologic and physiologic changes during the neonatal period are coming to constitute a nodal area of research. While the bulk of the literature on the human newborn infant has related to the loss in weight following birth, 1 investigation has also been made of such problems as changes in size of the uterus, weight of the adrenal glands, 2 capacity of the stomach 3 and calcium metabolism of bones 4 and teeth. 5 It is the purpose of this paper to report a study on changes of the size and contour of the thorax during the first postnatal week. Specifically, attention will be given to ( a ) the absolute width and depth of the thorax and ( b ) the trend of change in thoracic shape expressed by the ratio chest depth × 100/chest width. SUBJECTS The subjects were 68 newborn white infants, 36 boys and 32 girls, obtained through the department of
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