When doing 4D ultrasound, the baby is not moving may be caused by being in sleep state and other reasons, you can make the baby move through proper eating, proper exercise and communication with the baby. 1. Appropriate eating: when doing 4D ultrasound, pregnant women eat some food appropriately, which can promote the baby’s movement. 2. Appropriate exercise: If the 4D ultrasound baby does not move, pregnant women can do some appropriate exercise, such as walking slowly, climbing stairs, etc., can promote the baby activity. 3. Communicate with the baby: pregnant women can stroke the stomach, talk softly with the baby, or play some soft music, the baby will be more active gradually. If after applying these methods, the baby still does not move, you should consult a doctor in time to clarify the cause of the disease and treat it under the guidance of the doctor.