When pregnant women do four-dimensional examination when the fetal baby does not cooperate, can through appropriate activities, eat sweets, touch the pregnant belly and other ways to wake up the baby, make it cooperate with the examination. 1. Appropriate activities: if the baby does not cooperate when doing 4D ultrasound, pregnant women can go out and do appropriate activities for a while, such as going up and down the stairs, walking slowly, etc., appropriate exercise can wake up the fetus, so that the fetus is active. 2. Eat sweets: pregnant women can eat some candy, chocolate, cake and other sweets before the four-dimensional ultrasound, such food can improve fetal excitability, promote fetal activity, with the examination. 3. Touch pregnancy belly: pregnant women do four-dimensional examination when the baby does not cooperate, pregnant women can gently pat, or touch their own stomach, touch can wake up the sleeping fetus, so that the fetus to maintain a state of excitement, conducive to detailed examination. If the baby does not cooperate for a long time, you can choose to postpone the examination time, in addition, it is recommended that pregnant women pay attention to rest in life, avoid overwork, regular maternity checkups and so on.