The strong light spot of the left heart found during fetal ultrasound can generally be considered as the following cases: First, there is a fine dot-like calcification foci in the fetal heart cavity, if the light spot is relatively small, less than 5mm, it will gradually disappear with the development of the fetus, generally it is a simple dot-like calcification, do not worry. Secondly, there is a possibility that there is a problem with the fetal heart, it is likely that the fetal chromosomes are abnormal, but the chance of this is very low, you can observe 1-2 months, if the light spot is not absorbed, it is recommended that the pregnant mother do amniocentesis or non-invasive DNA to confirm whether the fetus is healthy. Thirdly, it is possible that the strong echogenicity is caused by the thickening of the tendons in the fetal ventricle. The strong light spot in the fetal heart found by 4D ultrasound is usually not a problem, it is just an ultrasound performance, don’t worry too much, just go to regular pregnancy checkups in a big hospital.