Definition reprinted with permission from Hood, Stephen B. (editor) available from Stuttering Foundation of America: Stuttering Words (Publication No 2: Speech Foundation of America)
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developmental disfluencies
The developmental repetitions, prolongations and stumblings in the speech of children learning to talk. In the natural development of speech, while learning to talk, most children's speech is marked by effortless developmental hesitations to some extent. Included in this category are word and phrase repetitions and such accessory vocalizations as the interjection of "um" and "ah."