It is normal for the fetus not to start at 39 weeks of pregnancy before the due date, so don’t worry too much. There are many reasons why the fetus has not started at 39 weeks of pregnancy, which should be analyzed according to the specific situation. If the fetus is relatively large and has not yet entered the pelvis, the mother’s cervix will not be stimulated and the labor period will be delayed. Generally speaking, the difference between the expected date of delivery according to the last menstrual period and the actual time of delivery is not more than 2 weeks, and pregnant women should pay attention to observe whether the fetal movement, amniotic fluid volume and placenta are normal, and choose a reasonable delivery method when they are in labor. It is recommended to have a reasonable diet in late pregnancy and to exercise properly to promote the fetus into the pelvis and facilitate delivery. If a pregnant woman is over 41 weeks and has not yet given birth, she needs to go to the hospital for examination and to induce labor according to the doctor’s advice to avoid adverse consequences such as intrauterine distress.