Generally, it is possible to encourage the baby to cooperate with the four-dimensional ultrasound examination through exercise, diet, and abdominal pressure, which can better observe the baby's condition in the uterus. Here are some specific steps:

1. Exercise

Before the examination, pregnant women should engage in appropriate exercise, such as climbing stairs or walking, which can increase the frequency of fetal movements and encourage the fetus to move in the uterus. This is beneficial for better completing the four-dimensional ultrasound examination and helps to assess the condition of the fetus.

2. Diet

Before the examination, pregnant women can eat some sweet foods, such as chocolate, candies, or small cakes, which can promote metabolism and stimulate the fetus to become excited. This can help prompt the fetus to change its position.

3. Abdominal Pressure

If the baby does not cooperate during the examination, the pregnant woman can gently pat or massage the abdomen to wake up the fetus and keep it in an excited state.

During pregnancy, women need to attend regular prenatal check-ups to better monitor their own and the fetus's health. Before the examination, pregnant women should also ensure sufficient rest and sleep, maintain a pleasant mood, and avoid anxiety and tension, which is beneficial for a smooth examination. If any abnormalities are detected during the examination, it is necessary to inform the doctor promptly for treatment to avoid affecting physical health.