A U-shaped pressure mark on the fetal neck is a descriptive diagnosis of ultrasound, which means that the baby is visible under ultrasound with a loop of umbilical cord around the neck, and the cord wrapping around the neck suggests a U-shaped pressure mark under ultrasound. If the umbilical cord is wrapped around the neck for two weeks, the ultrasound will indicate a W-shaped indentation. Therefore, ultrasound indicates a U-shaped pressure mark on the fetus’ neck, which is only one of the manifestations of cord encirclement. Is the baby at risk if the cord is wrapped around the neck? If the normal cord length is one or two turns, it will not affect the baby very much. However, if there are more circles, or if there is a risk of low amniotic fluid, which can affect the baby’s heart, or if the umbilical blood flow is not good, the baby may be at risk. Therefore, in the case of one loop of umbilical cord encirclement, it is enough to pay attention to fetal movement. If the number of circled umbilical cord is more, pay attention to review the fetal heart monitoring and pay attention to the change of baby’s fetal movement.