A bright spot in the left ventricle of the fetus is more common in the early stages of pregnancy and usually disappears around 28 weeks of gestation if the fetus is developing normally. If the development of the fetus is abnormal, it suggests that the heart has lesions or malformations, then the left ventricular spot will not disappear. 1. Normal fetal development: under the premise of fetal health, ultrasound observation found that the left ventricle of the fetus has a strong light, most of them do not belong to the non-pathological changes, with the growth of gestational weeks, the normal growth and development of the fetus, the left ventricle has a strong light will gradually become smaller around 28 weeks of gestation, and completely disappeared after the first trimester of pregnancy. 2. Abnormal fetal development: the fetus may have heart disease or malformation due to chromosomal variations, and the strong light spot is suggestive of abnormalities, which will not disappear until the fetus is born. If the pregnant woman in the ultrasound examination found the fetal left ventricle has a strong light spot, need to be further identified under the guidance of a professional obstetrician, through the cardiac ultrasound and other auxiliary means of examination, in order to rule out the possibility of chromosomal defects of the fetus, need to be regularly rechecked to ensure that the eugenic.