Routine ultrasound examination of the pregnant woman’s own heart and ultrasound examination of the fetus’ heart will not have any effect on the fetus. General ultrasound and 4D ultrasound are widely used in maternity examinations, which can not only understand the condition of the pregnant woman herself, but also effectively observe the development of the fetus during pregnancy. 4D ultrasound can even observe the fetus dynamically, capturing the facial expressions and movements of the fetus, and at the same time, it can target the heart structure and function to detect abnormalities in time. Pregnant women should not have frequent cardiac ultrasound when it is not necessary, because there is no accurate answer to whether excessive ultrasound will bring effects to the fetus, but to improve safety, the time and frequency of cardiac ultrasound should follow the doctor’s recommendation. Pregnant women need to expose their chest when having their own cardiac ultrasound, so wear clothing that is as wide, comfortable and easy to put on and take off as possible before the exam, and do not wear jewelry on your chest. Eat lightly and relax the day before the examination. When the fetus needs to have an ultrasound examination of the heart, it is recommended that the pregnant woman move appropriately before the examination and try to put the fetus in a position that can be easily detected, so as to avoid the examination results being affected by the obstruction of the limbs or improper position.