The fetus is always bulging on the right side, generally the fetal limb is on the right side of the mother’s abdomen, the fetus has a large range of limb activity during fetal movement, especially in late pregnancy, the fetus grows up and increases its activity power, the limbs may bulge a large bag in the abdomen when moving. In late pregnancy when the fetal head is in the pelvis, the fetal position is relatively fixed and the fetus is in left occipital anterior position, the limbs are on the right side of the mother and the limbs often move on the right side, if the pregnant woman has no special discomfort, it is a normal manifestation of fetal activity in the uterine cavity, the pregnant woman only needs regular maternity checkups, ultrasound at the right time, counting fetal movements at home, paying attention to a balanced diet and appropriate activities.