Ventricular septal defects can be self-healed within 3 years of age, and there are no statistical data on the rate of self-healing. The rate of self-healing is related to the size of the ventricular septal defect and the type of the defect, and the smaller the defect, the higher the rate of self-healing. 1. Defect size: small defects are less than 5mm in diameter, medium-sized defects are 5-10mm in diameter, and large defects are more than 10mm in diameter; the self-healing rate of small defects is higher, followed by medium-sized defects and the lowest by large defects; defects of 5-6mm are just up to the medium-sized standard, and the chance of self-healing is also higher. 2. Types of defects: they can be divided into 3 types: perimembranous type of ventricular septal defect, the defect site is in the membranous part of the ventricular septum, which is the most common type; secondly, subarterial type of ventricular septal defect, the defect site is in the funnel part of the ventricular septum; and thirdly, muscular type of ventricular septal defect, the defect site is in the muscular part of the ventricular septum; among them, the defects of the membranous part and the limiting defects of the muscular part have high rate of self-healing. When a pediatric ventricular septal defect is detected, it is important to go to the hospital for a comprehensive examination to clarify the size and type of the defect, and to choose an appropriate treatment plan under the guidance of a specialist.