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Placental expulsion (also called afterbirth) occurs when the placenta comes out of the birth canal after childbirth. The period from just after the baby is expelled until just after the placenta is expelled is called the third stage of labor. The third stage of labor can be managed actively with several standard procedures, or it could be managed expectantly (also known as ''physiological management'' or ''passive management''), the latter allowing the placenta to be expelled without medical assistance. Although uncommon, in some cultures the placenta is kept and consumed by the mother over the weeks following the birth. This practice is termed placentophagy. ==Physiology== It begins as a physiological separation from the wall of the uterus. The placenta is usually expelled within 15–30 minutes of the baby being born. Maternal blood loss is limited by contraction of the uterus following birth of the placenta. Normal blood loss is less than 600 mL. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Placental expulsion」の詳細全文を読む スポンサード リンク
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