Will ultrasound have any effect on the health of pregnant women and fetuses? Why must we do ultrasound? In the past, the old ancestors did not do ultrasound when they were pregnant, not the same to give birth to healthy children, this is the most asked question by pregnant women and their families, and also the most concerned issue. First, safety First of all, safety is currently the main concern, but so far, various clinical and animal tests have shown that ultrasound is safe for the fetus. Secondly, the necessity Secondly, why should we do ultrasound examination? Because China advocates eugenics, ultrasound examination is an important measure to ensure eugenics, and the following problems can be found through ultrasound examination: 1. Ultrasound in early pregnancy is very critical because the proportion of spontaneous abortion in early pregnancy is about 10% to 15%; 2. Ultrasound in 7 to 8 weeks of pregnancy can clarify whether the embryo is located in the uterus, whether there is a fetal bud and fetal heart. 3. The size of the fetal bud can be used to check the gestational week, especially for those pregnant women who have irregular menstruation and cannot remember their last menstruation; 4. In twin pregnancies, only the ultrasound in early pregnancy can help identify monozygotic or dizygotic twins. 5. In summary, pregnant women should relax and follow the doctor’s instructions for the necessary ultrasound examinations.