A small amount of tricuspid valve regurgitation in the fetal heart is not serious if it is caused by slow development and can continue to develop later. If it is caused by chromosomal abnormality, it may be accompanied by other abnormalities, which is more serious. Tricuspid regurgitation may occur during the growth and development of the fetus due to the small size of the fetus and its slow development. Usually, there is no need to worry too much about it, and if it is not accompanied by other complications, the fetus may gradually develop fully and the regurgitation may disappear. However, there are a small number of children with chromosomal anomalies, manifested by multiple malformations of the whole body, mental developmental insufficiency, etc., which will be accompanied by tricuspid regurgitation, and at this time, the development of the fetus has been seriously affected, which is more serious. If there is a small amount of tricuspid regurgitation shown by fetal heart ultrasound, it is recommended to consult a doctor in time, and under the doctor’s guidance, make appropriate treatment.