A nurse is caring for a client who is 1 hr postpartum following a vaginal birth of a newborn weighing 9 lb 6 oz. (4252 g). The nurse should recognize that this client is at risk for which postpartum complication?

A. Kernicterus: Unrelated to postpartum complications; it is a bilirubin-related condition in newborns. B. Uterine atony: Correct. A large infant increases the risk of uterine overstretching, leading to poor uterine contraction and postpartum hemorrhage. C. Gestational diabetes: This is diagnosed during pregnancy, not as a postpartum complication. D. Retained placental fragments: A possible concern but less likely than uterine atony in a client with a macrosomic infant.