The size of the belly in the 5th month of pregnancy varies according to the body shape and fetal development of each pregnant woman, so there is no specific indicator. Generally speaking, the uterus in the 5th month of pregnancy resembles a grapefruit with a slightly bulging belly, but the actual situation can be judged based on the results of the maternity examination. In the 5th month of pregnancy, the bottom of the uterus is about one finger below the belly button. At this time, the fetus can reach about 25cm in length and 300g in weight, and is in a period of rapid development. Therefore, pregnant women need to actively supplement calcium, protein, vitamins and minerals to accommodate the growth and development of the fetus. However, even so, it is important to pay attention to the weight change, keep a good record and communicate with the doctor during the maternity checkup so as to avoid pregnancy complications, huge babies and delivery difficulties caused by excessive weight gain. In addition, due to the increase in the area of the uterine cavity and the relatively small size of the fetus, in the fifth month of pregnancy, pregnant women can feel more obvious and regular fetal movements, usually 3-5 times per hour. If pregnant women feel obvious abnormalities in fetal movement, they should go to the hospital for examination in time to exclude unfavorable factors to ensure the healthy development of the fetus.