Cervix very backward in 39 weeks of pregnancy may be due to an immature cervix and improper sleeping position. A very backward cervix at 39 weeks of pregnancy may be caused by an immature cervix. The cervix is immature due to hormonal abnormalities, causing the cervix to be very retrograde, resulting in a pointed pelvis, low amniotic fluid, and possible lack of oxygen for the baby. The cervix is very backward in 39 weeks of pregnancy may be caused by improper sleeping position, 39 weeks of pregnancy pregnant women with a larger stomach, if the long-term use of supine position to sleep, may cause the uterus posterior position, the phenomenon of the cervix is very backward, can be corrected through the prone position to sleep or chest and knees side position to correct the uterine position. Therefore, patients with a very backward cervix at 39 weeks of pregnancy should go to the hospital as soon as possible, and after diagnosis, standardized treatment should be carried out under the guidance of the doctor.