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. Second, the necessity Second, why do ultrasound examination, because China advocates eugenics, ultrasound examination is an important measure to ensure eugenics, through ultrasound examination can find the following problems: 1, early pregnancy ultrasound is very critical, because the proportion of spontaneous abortion in early pregnancy is about 10% to 15%; 2, ultrasound at 7 to 8 weeks of pregnancy can clarify whether the embryo is located in the uterus, whether there is a fetal bud, fetal heart, timely diagnosis of ectopic pregnancy, the embryo is located in the uterus, the embryo is located in the uterus. The ultrasound at 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, and diagnose ectopic pregnancy, embryonic abortion, gravidity and other abnormalities in time; 3. The size of the fetal bud can be used to check the week of pregnancy, especially for those pregnant women who have irregular menstruation and cannot remember their last menstruation; 4. In twin pregnancies, only the ultrasound at early pregnancy can help identify monozygotic or dizygotic twins. In conclusion, pregnant women should relax and follow the doctor’s orders for the necessary ultrasound examinations.