question: Hello doctor, My baby was diagnosed with 4 mm VSD during the 20th week of pregnancy. After delivery, an echocardiogram was done and our pediatric cardiologist told that my baby has large perimembranous VSD shunting bidirectionally. But did not tell us the size. My baby is 3 months old now. I wish to know whether size matters in VSD or not. My baby has poor weight gain. So cardiologist told us to prepare for surgery. Currently, he is on Furosemide 0.2 ml twice a day.