The regulation of regular prenatal checkups for pregnant women is formulated in accordance with the characteristics of fetal development and maternal physiological changes. Its purpose is to check the fetal development and maternal health so that problems can be detected early and corrected and treated early. So that the pregnant woman and the fetus can pass through the pregnancy period smoothly. Now most pregnant women do not pay attention to prenatal checkups, some do not follow the doctor’s orders to follow up on time, some only 1-2 times during pregnancy, some come to do only B ultrasound, and some even do not do a prenatal checkup during pregnancy, and so on the occurrence of fetal death in the womb and other adverse consequences have been too late to regret. The ultrasound department of Beijing Aerospace General Hospital, Meng Junyan Regular checkups can continuously observe and understand the fetal development and physical changes of pregnant women at various stages, such as whether the fetus is growing and developing normally in the uterus and whether the pregnant women are well nourished, etc. They can also detect the early symptoms of common complications of pregnant women, such as pregnancy edema, pregnancy poisoning, anemia and other diseases, so that they can be treated in time and prevent the disease from developing into a serious stage. During pregnancy, the fetal position can also change. Since the fetus is floating in the amniotic fluid in the uterus and can turn frequently, sometimes the normal head position can turn into an abnormal breech position, which can be corrected in time if detected in time. If the checkup is not done regularly or too late, even if the abnormal condition is found, it will be difficult or impossible to correct because of the delay. Therefore, it is essential to have regular prenatal checkups.