Final answer:
The client delivering twins is at a higher risk for postpartum hemorrhage because the uterus is more likely to experience atony due to the increased stretching from carrying multiple pregnancies.
Step-by-step explanation:
The nurse identifies that a client in labor about to deliver twins is at higher risk for postpartum hemorrhage (PPH) as the complication this client is more likely to encounter. Multiple pregnancies, such as twins, stretch the uterus more than a single pregnancy, which can result in a greater likelihood of uterine atony following delivery. Uterine atony is when the uterus fails to contract effectively after delivery, which can lead to excessive bleeding or PPH. Because of the increased risk of PPH, medical professionals closely monitor clients delivering multiples for any signs of excessive bleeding after childbirth.