Which of the following is NOT a risk factor for postpartum endometritis?

Postpartum endometritis is an infection of the uterine lining that can occur following childbirth, particularly after a cesarean delivery or in the presence of certain risk factors. Factors that contribute to a higher likelihood of developing this condition include cesarean delivery, prolonged labor, and maternal diabetes mellitus.

Cesarean sections involve surgical intervention, increasing the risk of infection compared to vaginal deliveries due to the disruption of the body's natural barriers. Prolonged labor can lead to greater maternal exhaustion and possible exposure to infections, making it a risk factor. Maternal diabetes mellitus compromises the immune system and can affect wound healing, thereby increasing the susceptibility to infections, including endometritis.

In contrast, multiple gestation does not directly correlate with the risk of developing postpartum endometritis. While multiple births may increase the likelihood of other complications during and after pregnancy, they do not inherently contribute to the development of endometritis in the same way that surgical or prolonged labor does. Therefore, multiple gestation is not recognized as a risk factor for postpartum endometritis.