My child has a systolic mild ejection murmur. How serious is this and does he need any treatment?

Discuss with doc. If i listen to a kid often enough as they grow up i will eventually hear a murmur in most. Mild systolic ejection murmurs are often just flow related, like the noise water makes in a babbling brook .Flow thru slightly narrow pulmonary arteries are frequent a cause of systolic murmurs. Clarify with your dr whether the murmur means anything. Most murmur"bad" is addressed at birth.