What could cause a systolic heart murmur in a child?

Many are Normal: Many children develop Heart murmurs as they grow. They are caused by blood vibrating the heart as it beats. Sometimes it can be caused by a hole in the heart or other abnormal changes in heart valves. A visit to a pediatric heart specialist would be a great way to clarify this. Most of them are innocent ( not a significant health issue) and resolve without treatment. Get it checked

Many things: A murmur simply means that someone listening can hear blood flow. The sound could be from vibration through a normal heart. Alternatively, it could be due to holes in the heart or valve problems. Please discuss this issue with the child's doctor as he/she may require a referral to a pediatric heart specialist or obtain certain tests.

Many things: The most common systolic murmur is an innocent flow murmur. Some murmurs represent rapid blood flow through a tight valve or tube, some rapid flow through a whole. Many docs are rained to know based on exam, but a cardiac ultrasound is sometimes done to confirm or exclude the initial impression.