B-type ultrasound examination is a clinical use more, the application of a wider range of examination, in the obstetrics and gynecology ultrasound is an indispensable part of the maternity examination, in the whole process of the examination will not produce any radiation, the impact on the fetus is extremely small, and can help doctors to monitor the health of the fetus in the womb. Pregnant women need to do a lot of tests to evaluate the health and development of themselves and their babies, and ultrasound is one of the tests that are used more often in this period. In terms of principle, ultrasound is conducted through ultrasound, which is not like X-rays, CT, and other tests that have a great deal of radiation, and the test doesn’t have any ionizing or electromagnetic radiation, which has a very small impact on the pregnant woman and the fetus, so it is safe for you to do it. Moreover, the examination time of ultrasound is relatively short, usually about 5 to 10 minutes can be finished, so the harm to the fetus is also very small. However, every pregnant woman should have a correct understanding and knowledge of ultrasound, which is designed to monitor the growth and development of the fetus, and to observe whether there are any deformities in the baby, or whether there are any abnormalities in the pregnant woman. Although ultrasound has no radiation and is safe for pregnant women and fetuses, it does not mean that it can be done at will. There are limits to the time and frequency of ultrasound examinations, and it is best to follow your doctor’s advice. As long as you follow the doctor’s advice to do ultrasound during pregnancy, the number of times is not too much, will not affect the fetus, but do not do anything arbitrarily, no limitations on the blind examination.