A ventricular septal defect (VSD) of 3.5 mm would be considered small in a 3 month old child. These small holes often close up spontaneously in the first few years of life and cause no symptoms. There are no special restrictions required. They do not get larger. However, the location of the defect in the ventricular wall also dictates whether complicating features can occur in the future as the hole closes: in particular, the development of obstruction to either of the heart outflow tracts (subaortic or subpulmonary stenosis) or leakage of the aortic valve. You should discuss this with a pediatric cardiologist to see if your child's VSD is in a location (perimembranous or conoventricular) where this could be a future issue.
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