Usually, the fetal position starts to be fixed after 32 weeks of pregnancy, the fetus grows rapidly, the amniotic fluid is relatively reduced, the fetus is closer to the uterine wall, and the posture and position of the fetus is relatively fixed. Fetal position is divided into normal fetal position and abnormal fetal position: a. Normal fetal position includes occipital left anterior position and occipital right anterior position, the longitudinal axis of the fetus is in line with the long axis of the mother, the fetal head is below, the part of the pelvic inlet. The fetus can pass through the pelvis with the smallest diameter, so that the vaginal delivery can be carried out smoothly. Abnormal fetal position includes breech position and posterior occipital position, while transverse position and facial position are rare. Abnormal fetal position may be related to cephalopelvic asymmetry, placenta praevia, excessive amniotic fluid and fetal malformation. The abnormal fetal position can be corrected in the following ways: 1. Knee-chest position: except for the placenta praevia or amniotic fluid overload, the knee-chest position can be done between 28-32 weeks of pregnancy, kneeling on a hard bed, keeping the head low and hips high, with a pillow on the chest, bending the forearms of both hands upward and turning the head to one side on the bed, with the hips at right angles to the thighs. It can be done once in the morning and once in the evening, for about 15 minutes each time, and any discomfort during the process of doing so should be rested in time; 2. External inversion surgery: for those who do not work with knee-chest position, they can be hospitalized in week 34-36 of pregnancy, and under the supervision of B-ultrasound, the fetus will be turned to head circumference by experienced doctors through hand pushing and other movements. Before the operation, all indicators of the pregnant woman and the fetus need to be checked strictly to ensure that they are normal before the operation. If abnormal fetal heartbeat or intrauterine hypoxia is detected during the operation, the operation should be stopped in time. During this operation, the umbilical cord may be wrapped around the neck, broken, placenta abruptio, premature rupture of membranes, etc. There are certain risks, so pregnant women should choose carefully.