It is very encouraging that your baby is gaining weight, which is a great sign. Many small heart holes (like ASD or VSD) close on their own as the baby grows. Management primarily involves close monitoring by a pediatric cardiologist. If medical treatment is needed, doctors may prescribe diuretics (such as furosemide) to prevent fluid buildup in the lungs, or medications like digoxin to help the heart pump more easily. Nutritional support is also key to assist with growth. Surgery is typically reserved only for larger holes that do not close and affect her development. Please continue your regular follow-ups with her pediatric cardiologist.