Without seeing your child, I don’t know for sure how long it will take. Nor do you give me any information about him, such as how he is eating or doing clinically. I also do not know where the VSD is in the heart, which would influence my answer. However, a 3 mm VSD is typically considered a small defect, and, if he is doing well (that is, eating without getting out of breath or getting sweaty), it should spontaneously close by age 1 year. There are some babies who do not close the defect and it remains open. This does not typically cause any significant problems from a growth standpoint. The one risk while the defect remains open is an infection of the heart called endocarditis. Therefore, good oral hygiene is the most important assistance you can give to your son.
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