A review of studies relating to fetal oxygen levels during postmaturity seems to indicate that the oxygen demand of the fetus increases with intrauterine maturity. At the same time, animal tests show that blood coming from the uterine veins contains progressively less oxygen as pregnancy continues. The well-oxygenated baby can stand the effect of labor of any kind. There is, however, some question as to the increased incidence of stillbirths due to the oxygen deficiency resulting from postmaturity.
Kohl SG. OXYGEN LEVELS IN THE POSTMATURE FETUS. JAMA. 1957;165(13):1659–1662. doi:10.1001/jama.1957.02980310011004
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