Fetal movement may occur in the fourth month of pregnancy, but most pregnant women will not feel it until the fetus is 4.5-5 months old. If the examination shows that the development of the fetus is normal, then fetal movement a little earlier or a little later will have little effect. Strictly speaking, the fetus at 4 months of age has certain activities in the uterus, but it is a different concept from whether the pregnant woman can feel it or not. Depending on the physical condition of the pregnant woman, she may feel the movement of the fetus earlier or later. Usually, the mother of the first pregnancy feels the movement of the fetus relatively earlier than the mother of the second pregnancy. In all normal pregnancies, if the fetus moves more than 30 times in 12 hours or more than 3 times per hour, the fetus is in good condition. If the fetus moves less than 20 times in 12 hours, it means that the fetus may be suffering from hypoxia. If it is less than 10 movements, it means that the fetus is more at risk and its prognosis is poor. The fetus is about 4 months old, its length is about 15cm and its weight is 200-250g. From now on, the fetus’s sense of taste, smell, touch, sight and hearing begin to develop in special areas of the brain. It is recommended that pregnant women must do regular pregnancy checkups in order to keep abreast of the development of the fetus and to deal with any accidents in time.