HI! My first DD had a small VSD at birth too (it was a pin***** in her heart at the 20wks scan) and she had a murmur because it hadn't closed yet. A heart murmur is simply the sound that the blood makes as it is pumped through the heart. I was told to think of it as a gurgling stream. When someone does not have a heart murmur, there is no noise, it is silent as it gets pumped around, but with a murmur its like a wooshing sound. I have one myself too from a leaky mitral valve. It causes me no problems but i am supposed to have abs for dental treatment etc incase of blood infection.

My DD grew out of it by the time she was a toddler, but any child can get a heart murmur during an illness such as your little one has and most children will have one temporarily at some point. So long as he is fine, doesn't get exerted easily when playing and doesn't have a blue tinge around his mouth, then he will be fine - most murmurs are innocent and will go in time.