The causes of umbilical cord wrapping around the neck may be long umbilical cord, excessive amniotic fluid and active fetal movement. Normal fetal umbilical cord is 30-70cm. When the umbilical cord is too long, it may wrap around the neck when the fetus turns. When the amount of amniotic fluid is too much, there is more room for the fetus to move, and then the umbilical cord may wrap around the neck. Normal fetal movement is 3-5 times per hour. Cord entanglement occurs when the fetus is very active, moving around the uterus, stretching its legs, moving its arms, and turning in circles. Umbilical cord bypass is not an indication for cesarean section, but the condition of the fetus should be closely observed. In case of hypoxia, it is necessary to administer oxygen, etc., and consult a doctor if necessary. In case of intrauterine distress, even emergency caesarean section is performed.