A four-month-old fetus inside the womb may be sleeping, constantly rolling over, or making movements such as urinating or swallowing amniotic fluid. 1. Sleeping: The fetus spends most of its time in the womb in a sleeping state. 2. Turning over: the body organs of a four-month-old fetus are basically mature, and when the fetus wakes up from sleep, it can carry out some free activities, and it can turn over in the womb and move its arms and legs in conjunction with the activities. 3. Urination: the four-month-old fetus will urinate. 4. Swallowing amniotic fluid: four-month-old fetus can swallow amniotic fluid because it is wrapped in amniotic fluid. The fourth month of pregnancy belongs to the middle of pregnancy, pregnant women need to pay more attention to rest, do not do strenuous exercise. If there are abnormal symptoms, such as abdominal pain, bleeding, etc., you need to consult a doctor in time.