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Problems with the placenta can prevent it from providing adequate oxygen and nutrients to the fetus.
en.wikipedia.org The placenta is believed by some communities to have power over the lives of the baby or its parents.
en.wikipedia.org Effect of ionizing radiations, including radioisotopes, on the placenta and embryo.
en.wikipedia.org The period from just after the fetus is expelled until just after the placenta is expelled is called the "third stage of labour".
en.wikipedia.org As it takes no share in the formation of the placenta, this is also named the non-placental part of the chorion.
en.wikipedia.org