In fact, many healthy people have heart murmurs. More than half of all children have a heart murmur at some time. A normal murmur can get louder when the blood flows faster through the heart, like when kids have a fever . When your temperature goes down, the murmur may disappear. Others times a murmur can be heard because, in children, the heart is closer to the chest wall.
Many normal murmurs become harder to hear as children grow older.
Some murmurs just disappear eventually. Sometimes a heart problem causes a murmur. The heart may have a hole in it, a heart valve may leak, or a valve may not open all the way. This is a kind of doctor who has spent extra time learning all about children's hearts. The Nemours Foundation is a nonprofit organization devoted to children's health and is the largest physician practice delivering subspecialty pediatric care in the United States.