The initial development of the fetal heart is usually completed around the 18th week of gestation, and the actual development is not completed until about a year after birth. The fetal heart will initially develop at the 6th week, and the buds as well as the heart tube pulsations can be detected with the help of ultrasound. With the development of time, the heart and blood vessels can be observed at 8~10 weeks, and the fetal heart chambers are formed at about 14 weeks, and the fetal heart is usually initially developed at about the 18th week. Full development of the fetal heart is not complete until about one year after birth, when the foramen ovale gradually closes. Fetal heart examinations can be performed after the 18th week of pregnancy to observe the development of the fetal heart and to see if there are any malformations or other pathologies.