Four-dimensional that is, four-dimensional ultrasound, the baby does not cooperate with the four-dimensional ultrasound, it is recommended to take appropriate exercise, stroking the abdomen, appropriate food and other methods to make the fetal position change. 1. Appropriate exercise: when doing 4D ultrasound, the baby does not cooperate, it is recommended that the pregnant woman walk and climb stairs appropriately, etc., which can promote the activities of the fetus in the uterus, and help to change the position of the fetus. 2. Stroke the abdomen: when the fetus does not cooperate, you can also gently use your hand to stroke the abdomen, for the fetus to produce mechanical stimulation, may also cause fetal position changes. 3. Appropriate food: it is recommended to eat something appropriate, such as: drinking milk, eating chocolate, etc., also helps to timely replenish the energy needed by the fetus, which will help the fetus to move and change the fetal position. If your baby does not cooperate during the 4D ultrasound examination, it is recommended that you take appropriate treatment under the doctor’s guidance, or if necessary, you can go home and rest first, and then go back to the hospital for a recheck after 1 to 2 days.