Thirty-seven weeks, two umbilical cords around the neck.

Normal umbilical cord length is about 30cm~ 100 cm, umbilical cord around the neck will increase the risk of intrauterine hypoxia. If the safe length of umbilical cord around the neck exceeds the distance from placenta to maternal vulva, it is possible to give birth naturally. If the length of umbilical cord around the neck is shorter than 30cm or more than three weeks around the neck, cesarean section is generally recommended.