Hi I am 20M. The comments under this post are really helpful. Not old enough but have been stuttering my whole life. Only thing I'll recommend is to be hard on your kid because he is just 13. Once he becomes 16/17ish he will be resistant. Maybe just push him to summer camp anyway and make him do his exercises. If you scold him and he does his exercises, his muscles will be tight and more likely to stutter during the exercise which is GOOD because he will actually learn to deal with his stutter in other situations too. Just my POV. Hope he recovers. Glad you're a father concerned about stuttering(a subject ignored by most parents)