Im 17 now, I took speech classes all throughout elementary. My parents paid for it, and they still ask why I still stutter after taking those speech classes. I can't speak for everyone, but most of the time those speech classes dont work. For me, it was just stress at home and school that caused it. If your child got hurt, or just has a hard time making sounds, I would reccoment speech class, as the therapists can help them learn how to talk again.