For ventricular septal defects less than 5 mm in diameter, located in the perimembranous or myocardial region, secondary foramen ovale septal defects, and arteriovenous ductus arteriosus with a small diameter, there is a possibility of self-healing and surgery may not be urgent. However, the prerequisite is that the presence of this heart malformation does not have a significant impact on the growth and development of the child. Therefore, parents are required to review the patient regularly while waiting. The purpose is twofold: (1) to detect the tendency of the defect to decrease in size; and (2) to observe the presence of complications such as heart enlargement and increased pulmonary artery pressure. In children with no decrease in defect size and progressive increase in pulmonary artery pressure, there is no point in waiting and surgery is needed as soon as possible. Approximately one half of all children with precordial disease die within the first year of life due to severe cardiac anomalies. Survivors develop recurrent respiratory infections and developmental disorders at all ages of their growth and development. Mild cases may also be asymptomatic early on, but the presence of an anterior heart murmur will affect the child’s education and employment, if left untreated. Eventually, it will lead to pulmonary hypertension, heart enlargement, heart failure, and in some cases, endocarditis, embolism, hemorrhage, hypertension, which is life-threatening and brings a heavy mental and economic burden to the family.