Whether a ventricular septal defect can heal spontaneously is determined by its type and the size of the defect. Patients with partial perimembranous and myocardial ventricular septal defects with a defect diameter of <5 mm can heal spontaneously. Ventricular septal defects are a type of congenital heart disease. Patients with perimembranous ventricular septal defects are the most common type. Patients with defects <5 mm in diameter may heal on their own, but patients with defects >5 mm in diameter are basically unlikely to heal on their own and require surgical treatment. Patients with myofascial septal defects <5 mm may also heal on their own. However, in the case of infra-stem and intracrural ventricular septal defects, self-healing is unlikely. The younger the patient is, the greater the chance of self-healing; as the patient gets older, the chance of self-healing decreases and is generally lost after 5-6 weeks of age. Very small ventricular septal defects, if there is no hemodynamic abnormality, can be treated without surgery, and regular follow-up is sufficient, otherwise surgery is required.