There is a lot of info about breathing and stuttering. Some stutterers have recovered after learning abdominal breathing. There's a video from the UK’s National Health Service’s Stammer School, that's amazing. I'll include the link. People unable to even speak their names are conversing with strangers on the street after only 4 days. The treatment is all breath control and desensitization. https://youtu.be/bNkOeIBKZNs If you lose the link it's accessible on youtube at: Real Stories Stammer School This is so impressive that I continually post it on sites related to stuttering. I mastered my stutter at 70 by dealing with my abusive childhood through psychological therapy ( not that I hadn't been in speech and psychological therapy many earlier times during my life) however this latest time successfully dealt with my trauma. Anyway, if you believe breath has anything to do with your stuttering, please watch this encouraging 45-minute video. All the best, Sue.