A small amount of tricuspid regurgitation in fetal cardiac ultrasound may be normal, but it does not exclude the presence of chromosomal abnormalities, fetal malformations and other pathological factors. 1. Normal phenomenon: During the period of development, the heart of the fetus is not yet well developed, and a small amount of tricuspid regurgitation may occur. Usually, there are no other complications, and the majority of tricuspid regurgitation will develop normally through later review. 2. Pathological factors: If the fetal heart ultrasound has a small amount of tricuspid regurgitation, accompanied by other valvular and cardiac heart disease regurgitation, it may be due to the presence of chromosomal abnormalities in the fetus, fetal malformations and other reasons. Therefore, if there is a small amount of tricuspid regurgitation in fetal heart ultrasound, it is recommended to consult a doctor in a timely manner, and under the guidance of the doctor, improve the relevant examinations, clarify the causes of the disease, and provide symptomatic treatment.