Lung compliance and crying vital capacity of 52 normal, term, newborn infants were measured by a reverse plethysmograph during the first 5 days of life. Twenty-seven infants had late cord clamping (3 to 5 minutes after birth) and 25 had early cord clamping (within 5 seconds after birth). In 23 of these infants (12 late clamped and 11 early clamped) an additional determination of functional residual capacity was made during the first 6 hours of life. During the first 6 hours of life, the earlyclamped infants had a slower respiratory rate and higher compliance associated with a larger functional residual capacity. It is suggested that these findings are related to smaller heart volume and less pulmonary capillary venous filling in the earlyclamped infants as compared to the lateclamped infants.
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Oh et al. (1967) studied this question.