Ultrasound is an ultrasound that reflects sound back to the fetus, and the process is not as safe for the mother and fetus as chest x-ray or CT. The impact of ultrasound on the fetus is negligible. If the ultrasound is not completed on time, instead, problems are more likely to occur. Therefore, ultrasound is safe for all fetuses. The B ultrasound can help us to know the situation of the fetus in the belly of the pregnant woman in time, so pregnant women usually go to the hospital every once in a while to have an ultrasound examination, but because the mother of the baby in the belly are relatively small, so some pregnant women may worry that the ultrasound will cause bad effects on the baby in the belly of the pregnant woman, in fact, this worry is completely superfluous, B ultrasound does not cause any harm to the baby in the belly of the pregnant woman. In fact, this worry is completely superfluous. As mentioned above, ultrasound is a very common and safe test, and almost every pregnant woman has to undergo ultrasound during her pregnancy without harming her baby.