2 yr old heart problem

My 2 yr old was in the hospital about 1mth ago due to something viral that was causing her to run a fever and not eat or drink and just sleep nothing else. We was in there twice for a total of 4 days but while we was there was 3 different dr that were concerned with a murmur she had. Yes we knew she had an innocent murmur but was told that she also had a 2nd murmur so we were referred to a pediatric cardiologist we went last week and seen him for the first time they done an ekg he came in and said her ekg came back abnormal and he was concerned so now we have to go for an echocardiogram of her heart to see if she just need to be monitored or surgery. He said the 2nd murmur that he heard is only normally found in really young babies and is gone before they turn one. We go next week for the echocardiogram does anyone have any experience it this or ever heard of it