In our country, the best time for examination is usually 20-24 weeks. However, there are cases of examination at 25, 26, 27 and 28 weeks, mainly when there is a problem found in the tertiary prenatal ultrasound and a fetal echocardiogram is recommended, and there are also cases where a fetal echocardiogram finds a problem and a regular review is performed. after 30 weeks, it is more difficult to obtain a standard cut due to the influence of the fetal skeleton, the large volume and the fixed fetal position that affects the fetal echocardiogram. Alternatively, a fetal echocardiogram can be performed between 15 and 18 weeks. If the fetus is at high risk for congenital heart disease, the diagnosis is confirmed by reexamination at 20-24 weeks.