No heart murmur was heard but echo showed a tiny muscular apical vsd in 8 weeks daughter. what does it mean? docs didn't mention the size of vsd

VSD: These ventricular septal defects are seen in some children and adults and if the flow across the defect is small, it may close on its own as the child grows. They are usually followed with frequent echocardiograms. If necessary they can be closed with surgery. You should ask the cardiologist about the need for antibiotics for endocarditis prophylaxis.

Not much: A tiny muscular vsd is really inconsequential, and will likely close soon. Interesting question, if no murmur was heard, why was an echo done?

Spontaneous closure: Is very likely in small muscular vsd's. Typically we re-asess the patients at 3-6 months of age.

Likely OK: A tiny vsd is by definition tiny (usually a mm or two). They are very common and most often lead to nothing. Some even close on their own. However, some do not. And sometime they look tiny in little babies, but end up being larger. You need to follow-up with a cardiologist to determine if it changes as above. Your cardiologist can discuss things further, but most are not significant.