From mammals, it’s a common thing for many species, including primates eats their placenta of their young after childbirth. The reason may involve substances in the placenta that relieve postpartum pain or somehow stimulate the mother’s bonding response to the baby.

The traditional chinese medicine (TCM) too has too been using placentas since 1500s which is much longer time  compared with the modern medicine. And those who used due to an abundance of great properties believed to make a huge difference to a new mother’s mental health, recover and well being.