This describes the uninterrupted flow of words during speech. Some children develop a natural developmental dysfluency at the ages of 3-5, where they repeat some words or sentences. This most often resolves by the age of 7 without intervention if the environment does not exacerbate it. In some cases, true stuttering develops which is characterized by specific traits. Intervention is highly effective at eliminating stuttering, particularly in children under 12 years old.