About 5 per cent of children under five years will experience dysfluent speech while learning to talk and about a quarter of them develop chronic stuttering. Stuttering is more common in boys than in girls. Stuttering varies in degree of severity and according to the situation. It is episodic. For example, a child may be fluent for days or weeks at a time then dysfluency can reappear.
Adults commonly report good days and bad days.
People who stutter generally don t stutter when they sing, whisper, speak in chorus or when they can t hear their own voice.