7 months pregnant is generally recommended to take the left side of the sleeping position, occasionally the right side of the lying position for a moment can also be avoided to often take the right side of the sleeping position, because the late pregnancy when the fetus gradually grows, the formation of the inferior vena cava compression, the right side of the lying position may lead to fetal hypoxia, frequent fetal movement, which affects the health of the fetus, and in addition may lead to the pregnant woman’s lower extremities varicose veins. The left lateral position can relieve the right uterine compression on the vascular nerves and other tissues, avoiding fetal hypoxia, and also allow the blood flow in the inferior vena cava to be unobstructed. It is recommended to monitor fetal movement at any time when lying on the right side, if frequent fetal movement occurs, take the left side lying position to reduce fetal pressure.