Cord winding is a very common phenomenon, with some studies showing that about 30% of fetuses are born with a cord winding. Causes of cord winding: The umbilical cord of a fetus with cord winding tends to be longer and more mobile. On the basis of adequate cord length, if the fetus is more mobile, then the cord may wrap around the neck as the fetus moves. If the fetus moves in the direction of the winding cord, it may wind around the neck one or two more times. If the fetus moves against the direction of the winding cord, the winding cord will loosen itself, so often the ultrasound indicates that the cord is winding around the neck, and then it disappears after a while, and then it will wind again after a long time, sometimes one or two more times. If the umbilical cord is long enough, the umbilical cord is only loosely around the neck and generally will not be hypoxic, if the umbilical cord is just long enough, the length of the umbilical cord will be reduced by 10-12 cm if the umbilical cord is wrapped around the neck for one week, and the umbilical cord will be too short, which may cause fetal hypoxia. The more the number of wraps around the cord, the greater the possibility of hypoxia. If the fetal movement is suddenly too frequent or significantly reduced, it is recommended to consult a doctor. The choice of delivery method for cord winding: 1-2 weeks of winding is not an indication for cesarean delivery, vaginal delivery can be attempted, but the fetus should be closely observed during the trial of delivery. If the fetus shows signs of hypoxia, a cesarean section is recommended.