Before the end of the 13th week of pregnancy, there is no requirement for sleeping position, the end of the 14th-27th week of pregnancy, the left side lying position or right side lying position, after 28 weeks of pregnancy, the left side lying position is dominant. Before the end of the 13th week of pregnancy, the uterus does not increase significantly and does not protrude from the pelvis, so there is no great requirement for the sleeping position, you can choose to sleep in the left lateral position, right lateral position or supine position, try not to lie prone for a long time, so as not to compress the abdomen and internal organs and cause discomfort. At the end of 14-27 weeks of pregnancy is the mid-pregnancy stage, at this time the uterus is enlarged more obviously, choose to sleep on the left side of the lying position and the right side of the lying position, try not to long time lying on the back or prone position. After 28 weeks of pregnancy, the uterus will be rotated to the right, try to choose the left side of the position to sleep, reduce the pressure on the inferior vena cava, but also to provide the placenta with more adequate blood oxygen, is conducive to the normal development of the fetus in the womb. Sleeping position during pregnancy should be decided by the individual, try to choose a comfortable position, and consult a doctor if you feel unwell.