Generally speaking, occasional right-side lying in late pregnancy has no effect on the fetus, but there is a possibility that the fetus may be compressed if lying on the right side for a long period of time. It is generally recommended that in late pregnancy, pregnant women lying on the left side is the best. However, if the pregnant woman is habitually lying on the right side, after sleeping, the pregnant woman does not have any discomfort, and then the fetal movement and fetal heart rate and the previous than there is no change, then the right side of the lying on the right side of the fetus generally have no effect on the fetus. However, it should be noted that long-term right-side lying position may aggravate the uterus in a right-handed state, may compress the fetus, resulting in fetal activity or developmental restrictions, resulting in intrauterine oxygen deficiency. Therefore, if the fetal movement and fetal heartbeat accelerate or slow down after lying on the right side of the pregnant woman, then you need to go to the hospital in time for examination, to avoid intrauterine hypoxia of the fetus. In late pregnancy, pregnant women should undergo regular prenatal checkups to determine the health status of the mother and child as well as the development of the fetus.