If your son is stuttering, it is very, very, very unlikely that he wants to. Most likely he does not want to, is not doing it on purpose, and so cannot simply stop. Asking him to stop is asking for something he cannot deliver, which will only further erode his confidence along with his fundamental sense of self control. This will only make the stuttering worse. It may be incredibly hard, but your best moves are: • Stay relaxed when listening to your son. Practice wearing a loosely pleasant, curious and unstrained expression. Reply as though his speech was normal and you understood every word. If you don't understand him, apologize for your lack of comprehension and ask if he'd mind trying again. • Get him to a speech therapist. Don't deny that the stutter exists, but make it sound like this is a normal thing that many kids do. Odds are great that this is a phase. With some patience and support, you may even come to forget that this ever happened. As a near life-long stutterer, I wish the best for you and your boy.