Pregnancy initiation is the expression of excitation of the smooth muscle of the uterus when the pregnant woman is in labor. Generally, pregnant women will start around 40 weeks of pregnancy, 39 weeks of pregnancy does not start is a normal phenomenon, not necessarily related to the total lying, exercise less, do not need to worry excessively. If you do not start at more than 41 weeks, you need to go to the hospital for relevant examination. Usually, pregnant women are advised to maintain a proper amount of exercise before delivery to enhance their physical fitness and prepare for the birth. A normal pregnancy is around 40 weeks. Depending on the fetal position and the maternal capacity, the time of starting and delivery may vary, and delivery at 37-41 weeks is considered full-term pregnancy. Poor fetal position, lack of complete contact of the fetal head with the cervix, and weak maternal labor may affect the time of labor initiation in late pregnancy to some extent. Exercise in the late stages of pregnancy, such as walking and simple yoga, will not affect the natural delivery and will help to enhance the physical fitness of the pregnant woman and promote the development of the fetus, which will to some extent facilitate a smooth delivery. If there is a small amount of vaginal bleeding, the color of bleeding is red or coffee, the symptoms of contractions that last for a short time and are irregular at night, or some pregnant women feel a sense of relief in the upper abdomen because the fetus has entered the pelvis, it often indicates the signs of labor, different pregnant women can have different symptoms and degrees of starting and signs of labor.