Fetal position RSA is breech position, R is right, S is sacral, A is anterior, mainly refers to the fetus’s sacrum is located in the right side of the pelvis in front, also known as right sacral anterior position, is an abnormal fetal position. When the fetal position is RSA, the fetus faces the cervical opening with the fetal buttocks, because the fetal buttocks are relatively small and cannot completely block the cervical opening. When the water breaks, the umbilical cord is easy to slip out of the gap, resulting in prolapse of the umbilical cord, and delivery of the umbilical cord is not finished within 8 minutes after delivery, which will cause the umbilical cord to be extruded for too long, and may lead to the death of the fetus.The RSA fetal position can be turned to cephalic position before 34 weeks of pregnancy in general, and after ultrasound, if there is no symptom of the umbilical cord wrapping around the cervix, abdominal pain, vaginal bleeding, and the position of the placenta is normal, you can perform the knee-chest under the guidance of the doctor After the ultrasound examination, if there is no symptom of abdominal pain around the umbilical cord and vaginal bleeding, and the position of the placenta is normal, the fetal position can be corrected by knee-chest position under the guidance of doctor. After 32-34 weeks of pregnancy, the position of the fetus is relatively fixed. If the fetus is still in the breech position, it is difficult to change it to the cephalic position, and cesarean section is recommended.