It is normal for the baby not to roll over when having a 4D ultrasound. It may be caused by the baby falling asleep, etc. The baby may roll over by means of changing the position of the pregnant woman, exercising appropriately, eating something, etc. The baby may also be examined again on another day. It is normal for the baby not to roll over during the 4D ultrasound, which may be caused by the baby falling asleep. At this time, the pregnant woman can make the baby wake up by changing the position, exercising appropriately and eating something. However, even so, the baby does not necessarily roll over when he wakes up. If he does not roll over, he can come back for the examination on another day. If during the 4D ultrasound, the pregnant woman finds that the baby has not rolled over, the pregnant woman should not be too nervous and anxious, relax and make an appointment for the next examination.