At 34 weeks, the fetus has already developed a large size, and breech position cannot be reversed by itself, and needs to be corrected by external methods. Breech position is relatively more likely to be corrected at around 30-32 weeks of pregnancy, while at 34 weeks of pregnancy the fetus is already relatively large and the range of movement in the uterus is getting smaller and smaller, so this situation can not be reversed by itself, but can only be corrected by external methods, such as chest-knee lying down method. Breech position is a kind of abnormal fetal position in the uterine cavity, when corrected by chest-knee recumbent position, it is necessary to pay attention to the fetal movement and fetal heart to avoid fetal hypoxia. It is also important to note that breech position cannot be corrected by the chest-knee position method if the fetus has umbilical cord around the neck. If the breech position cannot be corrected, you can go to the hospital to have a relevant examination, and the mode of delivery will be determined after the doctor’s examination and evaluation. Cesarean section can be chosen if necessary.