The strong light spot in the left ventricle of the fetus as shown by 4D ultrasound is a soft indicator in the maternal examination, and if there are no other abnormal indicators, there is usually no need to worry too much. Most of the strong light spots in the left ventricle have no clinical significance and may be caused by a variety of reasons, most of which are physiological manifestations of the developing fetus and gradually decrease with the increase of gestational weeks. A few of them may be caused by other intra- or extra-cardiac abnormalities, such as congenital heart disease, chromosomal abnormalities, etc. They are usually combined with other structural abnormalities, which should be taken seriously and should be observed by regular maternity checkups and, if necessary, fetal non-invasive DNA testing or amniocentesis, so that timely intervention can be made if abnormalities are found. Generally speaking, the best time for 4D ultrasound is from 24 to 28 weeks of pregnancy, when all major organs of the fetus have developed, the amniotic fluid is appropriate and the fetus has entered the abdominal cavity, so it is convenient to perform 4D ultrasound for screening of fetal abnormalities. It is recommended to develop good living habits, do moderate exercise in the morning and evening, such as walking and yoga, but do not engage in strenuous physical labor; live a regular life and ensure sufficient sleep time.