According to this article:
"If
a blood pressure gauge is placed on an unclamped umbilical cord, it will pick
up pressure rises as high as 60 mm Hg with each uterine contraction. This
indicates that these contractions are intimately involved in the transfer of
placental blood through the cord. A striking pressure rise, which persists
through the first few hours of life, is also evident in the baby's vena cava
and right atrium of the heart. All studies on this indicate a sign...
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