Somebody asked a centipede which leg he started out with when he went for a walk. This centipede thought and thought and thought about it—and was never able to walk again.
Point: Some human actions come naturally. Try to consciously walk down a flight of stairs by putting one foot ahead of the other, and you will trip. Such is the case with young people learning how to talk. Call attention to their stumbles and you will soon develop a perfectionist—or in this situation a stutterer.