Do four-dimensional ultrasound when the baby position does not cooperate, you can through appropriate walking, music or dietary stimulation and other methods to promote fetal fetal movement to change the position. 1. Appropriate walking: If the fetal position does not cooperate when doing four-dimensional, pregnant women can appropriately change the position, or appropriate walking, by changing the position and walking may change the fetal position, so as to achieve the ultrasound section requirements. 2. Music or dietary stimulation: 4D does not cooperate, pregnant women can play soft music placed on the abdomen, or a small amount of food to stimulate fetal movement, may also play a role in changing the fetal position. If after the above methods still can not meet the requirements, do not need to worry too much, you can make an appointment for the next examination time to check again; four-dimensional ultrasound is a pregnancy screening fetal major malformations, if there is any abnormality, consult an obstetrician in a timely manner.