5 months of pregnancy can lie flat, but because the uterus has increased in 5 months, pregnant women lying flat may have compression symptoms, so there are the following precautions: 1, women 5 months of pregnancy can lie flat properly, pay attention to the symptoms of dizziness, palpitations, chest tightness, etc. when lying flat, no abnormalities can be properly lying flat; 2, pregnant women lying flat should not be too long, especially when sleeping, can alternately change position, to the left Side lying position is the main; 3, if pregnant women are used to lying flat to sleep, can be in the right hip pad with blankets, pillows, etc., so that the pelvis tilted to the left, to play the effect of the left side lying position, while you can gradually develop the habit of lying on the left side. In the middle and late stages of pregnancy, the uterus gradually increases, and it is easy to cause compression of the abdominal aorta, especially when lying down, so that the pregnant woman herself and the fetus have symptoms of hypoxia. Therefore, after 5 months of pregnancy, it is recommended to take the left side lying position, which is conducive to blood circulation and fetal development.