Labor is a normal physiological process for women. It is normal to deliver two weeks before or after the due date, but if you are not able to deliver normally after two weeks, you are considered to be pregnant after the due date. It is obvious that late pregnancy is harmful to the health of mother and child. The main hazards are: a. It is easy to have a difficult delivery, because the pregnancy is too long, more than 42 weeks, the amount of amniotic fluid will slowly start to become less, and later will be less than 100 ml. The consequence of too little amniotic fluid is that it will cause the opening of the uterus to be slow during delivery, prolonging the first stage of labor and making it easy to have a difficult delivery. The direct result is that the amount of oxygen supplied to the fetus by the placenta decreases, which may cause the fetus to die in the womb due to lack of oxygen. Another consequence of the aging and declining function of the placenta due to overdue pregnancy is that the amount of nutrients obtained by the fetus from the placenta is significantly reduced, which can easily cause fetal malnutrition. Fourthly, the risk of neonatal complications is increased, and the rate of neonatal diseases is significantly higher in term pregnancies than in normal deliveries. There are so many dangers of overdue pregnancy, so what can be done to avoid overdue pregnancy? The time of pregnancy is calculated from the date of the last menstruation, which means that the last menstruation time must be mastered, and it is best to regulate the menstruation before pregnancy, and regular menstruation will help to project the time of the expected delivery. Second, after pregnancy must do a good job of regular pregnancy tests, the first pregnancy test in the sixth week of pregnancy, and then build a file and card, do a good job of regular pregnancy tests on time, always pay attention to the changes in the development of the fetus. After 37 weeks of pregnancy, you need to do prenatal checkups every week to check the changes of the fetus. If there are no signs of labor after one week of the expected date of delivery, you must go to the hospital for a good examination and let the doctor diagnose whether you are in a late pregnancy according to the size of the fetus, amniotic fluid content, determination of placental function, fetal maturity or through “B ultrasound”. If there is a problem of overdue pregnancy, it must be dealt with early, if the normal pregnancy can not continue, it may be necessary to induce labor, to ensure the health of the child.