The patient has experienced a postpartum hemorrhage at 6 hours postpartum. After controlling the ...

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Rationale 1: Uterine atony, in which the uterus relaxes, is the most common cause of early postpartum hemorrhage (within the first 24 hours after delivery).
Rationale 2: Although blood can pool in the vagina and thus pour out when the patient stands, this does not constitute a hemorrhage.
Rationale 3: Although breastfeeding stimulates the release of oxytocin, which causes the uterus to contract, bottle-feeding does not cause hemorrhage.
Rationale 4: Had the placenta embedded abnormally (as in placenta accreta), the hemorrhage would have occurred immediately after the placenta delivered.