Before the 7th month of pregnancy, the position of the pregnant woman is not directly related to the lack of oxygen to the fetus, because no pregnant woman can sit or stand for a long time, and all of them have to give proper activities, which will improve the local blood circulation so that the fetus will not be hypoxic. Unless there is a pathological condition that can cause fetal hypoxia, such as the umbilical cord is too short, or the umbilical cord is tightly wrapped around the neck, only then will fetal hypoxia occur. After 7 months of pregnancy, the uterus will have a mild right rotation, and after the right rotation, the uterus will have localized ischemia and hypoxia, so the fetus will also have hypoxia. At this time, it is better to lie on the left side when resting to correct the right rotation of the uterus and improve the situation of ischemia and hypoxia. If it is in sitting, pregnant women do not sit for too long on the time.