singing can really help with this, goofynina. or, reciting poetry - loudly - too. but singing gives confidence to the stutterer and helps to overcome it, eventually.(my younger brother was a chronic stutterer for most of his life- but not now...)love~LL~
Have him learn some sign language to help some of it.
i know the poetry thing works, goofynina. my brother cured himself of this problem that he'd had for most of his life. he found that it was easiest when he yelled the poetry near noisy, heavy machinery, where he worked. the noise helped to keep him from being self-conscious about what he was doing.it didn't take long to work, either.love~LL~
More info here:National Institute on Deafness and Other Communication Disorders through the National Institutes of Healthgo to: http://www.nidcd.nih.gov/health/voice/stutter.asp