Under normal circumstances in late pregnancy, ultrasound examinations can be performed every 2-4 weeks and 1 week after 37 weeks of pregnancy, the exact timing of which may vary depending on the individual condition of the pregnant woman. Late pregnancy generally refers to 28-40 weeks. From 28 to 36 weeks, you need to have an obstetric examination every 2 weeks, and repeat ultrasound at 30 weeks to observe the fetal structure, and at 34 weeks to observe the size of the fetus. If there is no abnormality in the fetus, placenta and amniotic fluid during the ultrasound examination at around 36 weeks of pregnancy, you can also have an obstetric examination once a week during 36-40 weeks. In addition, the number of ultrasound examinations should be increased according to the specific situation, and if necessary, the pregnancy should be terminated in time. If the fetus is not in a good position, the umbilical cord is wrapped around the neck, the amniotic fluid is too much or too little and other abnormalities are detected in the 8th month of pregnancy, the number of ultrasounds should be increased according to the doctor’s recommendation. At the end of the 40th week of pregnancy, an ultrasound examination is usually required once every 3-7 days. Ultrasound examination helps to monitor the growth and development of the fetus. Pregnant women should follow the doctor’s advice to go to the hospital regularly for examination so that abnormalities can be detected early and dealt with in time.