Ultrasound has no effect on the fetus. b ultrasound is a commonly used examination method, is through the instrument emits ultrasound, receive ultrasound feedback signals, scanning human tissues of an examination method, this examination method is non-invasive and non-radiation, will not have an adverse effect on the growth and development of the fetus, so b ultrasound during pregnancy is a commonly used method of examination for pregnant women. If you are pregnant in early pregnancy, ultrasound can clarify the location and number of the gestational sac, the development of the fetal heart and buds, and exclude ectopic pregnancy; in mid-pregnancy, ultrasound can clarify the development of the fetus, whether there are malformations, etc.; and in late pregnancy, it can clarify the size of the fetus, the maturity of the placenta, and the amount of amniotic fluid. If pregnant women need to carry out b ultrasound examination, it should be carried out under the operation of a professional physician, so as to avoid improper operation, which may lead to adverse pregnancy outcomes.