The age at which surgery is appropriate for congenital heart disease is controversial and should be determined by the type of congenital heart disease and the early onset of symptoms. Most children with congenital heart disease should be operated as early as possible, and if the surgery can be performed before school age, it will not affect the child’s schooling and can reduce the burden on the society and family. If the condition requires, such as heavy malformation, early onset of symptoms, recurrent heart failure and endocarditis, and life-threatening, the age limit may be waived. At present, congenital heart disease surgery in infancy is well performed in larger cardiac centers or hospitals in China, and age and weight factors are largely disregarded. It is generally believed that most patients with atrial septal defect and ventricular septal defect can be considered for surgery regardless of whether they have symptoms or not. Of course, the ideal time for surgery is between the ages of 6 months and 4 years, because surgery is relatively risky and expensive when the child is too young, and some of the defects may still close on their own, while children who are too large may have growth and developmental delays and miss school.