*Adjusted for age, parity, smoking, weight gain, preeclampsia, fetal growth restriction, gestational diabetes, premature rupture of membranes, BMI, immobilization, multiple pregnancy, method of conception, mode of delivery, postpartum infection, postpartum bleeding, and postpartum surgery. †Surgery = curettage, evacuation of hematoma or abscess, or re-operation after cesarean. GA, gestational age; BW, birth weight; WBC, white blood cells