When the newborn's crib was moved suddenly, the nurse noticed that his legs flexed and the arms fanned out, and then both came back toward the midline. The nurse would interpret this behavior as:

Precipitous birth

This is because precipitous birth, which is defined as a labor that lasts less than three hours from the onset of contractions to delivery, is a risk factor for postpartum hemorrhage. This is because the uterus may not contract well after a rapid delivery, leading to uterine atony and bleeding. Other risk factors for postpartum hemorrhage include uterine overdistension, oxytocin use, placental abruption, placenta previa, infection, coagulation disorders, and previous history of postpartum hemorrhage.

Choice A is not correct because gestational hypertension is not a risk factor for postpartum hemorrhage. It is a condition that causes high blood pressure during pregnancy and can lead to complications such as preeclampsia, eclampsia, and placental abruption³.

Choice B is not correct because small for gestational age newborn is not a risk factor for postpartum hemorrhage. It is a condition that indicates that the baby's growth was restricted in the womb and weighs less than 90% of other babies of the same gestational age. It can be caused by maternal factors, placental factors, or fetal factors⁴.

Choice C is not correct because a two-vessel umbilical cord is not a risk factor for postpartum hemorrhage. It is a condition that occurs when the umbilical cord has only one artery and one vein instead of the normal two arteries and one vein. It can be associated with congenital anomalies, intrauterine growth restriction, and stillbirth.

Fever. This is because fever is a sign of infection, which is a common and potentially serious postpartum complication. Infection can affect various parts of the body, such as the uterus (endometritis), the bladder (cystitis), the breast (mastitis), the wound (wound infection), or the blood (sepsis). Infection can cause symptoms such as fever, chills, pain, foul-smelling discharge, redness, swelling, or warmth at the site of infection.

Choice A is not correct because the change in lochia from red to white is not a sign of postpartum complication. Lochia is the vaginal discharge that occurs after childbirth. It changes color and amount over time, from red to pink to brown to yellow to white. This is a normal process of healing and does not indicate a problem unless the lochia is foul-smelling, heavy, or contains large clots³.

Choice B is not correct because fatigue and irritability are not signs of postpartum complications. Fatigue and irritability are common feelings after childbirth due to hormonal changes, sleep deprivation, physical recovery, and emotional adjustment. They do not necessarily indicate a problem unless they are severe or persistent and interfere with daily functioning or bonding with the baby.

Choice D is not correct because contractions are not signs of postpartum complication. Contractions are normal after childbirth and help the uterus shrink back to its pre-pregnancy size. They are usually mild and subside within a few days. They may be more intense during breastfeeding due to the release of oxytocin, which stimulates uterine contractions.