Under normal circumstances, postpartum hemorrhage is one of the serious obstetric complications that can endanger the life of the mother. It is most commonly due to poor uterine contraction after childbirth, causing bleeding, and generally occurs within 24 hours after childbirth or as late postpartum hemorrhage occurring more than ten days after childbirth. If a year has passed since childbirth, there generally will not be instances of severe hemorrhage. It is advised to undergo an ultrasound examination within 42 days after childbirth to confirm whether the recovery of the uterus and its appendages is satisfactory. If the uterus has recovered back to its normal pre-pregnancy state, it generally will not cause severe hemorrhage.