The umbilical cord has blood vessels that go from the fetus to the placenta and back again. The placenta attaches to the wall of the mother’s uterus, where there is a tangled, intertwined system of blood vessels. The placenta blood vessels lay next to the maternal blood vessels.
So, it’s not poop. In fact the blood vessels on the fetus’ side don’t go to the intestines, they just kinda dump into the bloodstream near the liver. Fetus isn’t eating anything, so no poop.
As the fetal heart beats and fetal blood circulates , it goes out to the placent and back. While at the placenta, where the fetal vessels lie alongside the mother’s blood vessels, they exchange some things. The baby picks up nutrients from the mom, and dumps off waste products into mom’s bloodstream, where they get processed like her own cellular waste, mostly by her kidneys.
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