When pregnant women do 4D ultrasound examination, they need to pay attention to: 1, correct understanding and treatment of 4D ultrasound examination results, 4D ultrasound examination is only an imaging examination method, the examination results are more intuitive and accurate, but there may also be errors, for small developmental abnormalities, there may be missed diagnosis. 2, master the time, the time of ultrasound examination, has a great impact on the accuracy of the examination results, it is best to do 4D ultrasound examination between 22-26 weeks. The best time to do 4D ultrasound is between 22-26 weeks. 3, 4D ultrasound examination needs to be booked in advance, and the time of thinking ultrasound examination should be booked at 18-20 weeks of pregnancy. 4, 4D ultrasound examination may require pregnant women to eat in moderation to induce fetal movement of the baby, and pregnant women can carry snacks such as chocolates and cakes before going to the hospital. 5, 4D ultrasound examination does not require holding urine or fasting, and the examination process may It may be necessary to dress and undress repeatedly during the examination, so pregnant women should wear clothes that are easy to dress and undress for the examination.