Heart murmurs are extra noises heard with each heartbeat.
Some murmurs occur even though the heart and blood vessels are completely normal.
These murmurs are called innocent murmurs. There are several different types of innocent murmurs that occur in childhood. Some occur when the child is very young, and others are heard later in childhood. The heartbeat has two distinct sounds that you can hear with a stethoscope. These two thumping sounds are the sounds of the heart valves closing.