Stuttering is not uncommon in children between the ages of 2 and 5. For many children, it's simply part of learning to use language and putting words together to form sentences. It may come and go, and it may last for a few weeks or for a couple of years. Most children outgrow stuttering on their own without professional intervention. But for some, stuttering can become a life-long condition that causes problems in school and in functioning as an adult.