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darw1nf1sh OP t1_jdmamzn wrote

Reply to comment by MrCW64 in TIL, the placenta that forms with a fetus isn't created by the mother. It grows from the fertilized egg and some fetuses actually develop outside the uterus attached to the intestines in the body cavity. by darw1nf1sh

The TIL bit, is that the placenta does not develop directly from the mothers body, but rather the egg, as part of its development, differentiates cells into the placenta AND the fetus directly. This only happens to fertilized eggs, so the mother cannot do this on her own. My naive ass thought the placenta was grown by the woman's body. It is not.

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