B-type ultrasound examination is an examination method that detects the presence of abnormal lesions in the area being examined through the penetration of sound waves of a certain frequency. There is no radiation generated during the ultrasound examination, and the frequency of ultrasound is within the safe range, so it will not have an adverse effect on the human body and will not affect the normal development of the baby. The ultrasound coupling agent needed for ultrasound examination is a non-toxic liquid with no significant irritation and no adverse effects on both the pregnant woman and the fetus. Ultrasound is one of the most widely used and safe imaging methods in obstetrics that can be repeated several times. When the number of ultrasound examinations needs to be increased during pregnancy for various reasons, there is no need for pregnant women to worry that ultrasound examinations will have adverse effects on fetal development.