Stuttering is an interruption in the forward flow of speech. It is thought to be caused by a number of factors including genetics, the environment and a neurological component. There are five developmental levels of stuttering and it is important to distinguish among them. Normal Disfluency Age range: 18 months - 6 years old Types of disfluencies include: Interjections (I want, uh, cookies) Revisions (I want----I see the dog) Word Repetitions (Look look over here!) Phrase rep