The child is congenital heart disease: ventricular septal defect, 4 mm. 1 year-old child, ventricular septal defect, 4 mm may naturally close. The child's illness is not serious. It should have little impact on children. It is recommended to have a regular physical examination and have a cardiac ultrasound every 1-2 years. Check it at any time if necessary. If the ventricular septal defect tends to increase gradually, or the child's development, activity and physique are obviously affected, or the defect is still 4mm at the age of four, it is recommended to operate before the age of four. Because of what children remember after they are four years old. If it is an operation, it is recommended to repair the ventricular septal defect through a cosmetic incision under the right armpit. Schematic diagram of small cosmetic incision in right armpit (

) Like a normal child after the operation. No sequelae. In developed countries, minimally invasive occlusion is limited to muscular ventricular septal defect and patent ductus arteriosus. In the past, developed countries have also done minimally invasive occlusion of ventricular septal defect. Because of many problems, this method was eliminated. I hope the above reply is helpful to you.