What is stuttering? Stuttering is a communication problem in which spoken words or sounds are involuntarily repeated, drawn out, not completed, or skipped. Stuttering is not unusual in young children between ages 2 and 7 years. Stuttering that begins during a child's intensive language-learning years and resolves on its own sometime before puberty is called normal disfluency. It is considered a normal phase of language development. Developmental stuttering is a speech problem that persists, gets worse over time, and causes embarrassment or discomfort. What causes stuttering?