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.

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.