Baby was born on October 17, 2019, was 2.6 kg. The baby is now 3 months old and weighs almost 4 kg. At antenatal examination, the diagnosis of congenital heart disease, ventricular septal defect syndrome and pulmonary stenosis was diagnosed. I took her to the hospital and was advised that she would have 3 surgeries before the age of 3. So the doctor asked, if the first surgery is the first intervention? Are there any complications from heart surgery for children under 3 years old? Is the baby healthy after surgery? Is such a small child afraid of not being able to operate?