I was in speech therapy from a young age, too, and breathing helped, but I had to go a bit further than just focusing on breath control. What really flipped the

I was in speech therapy from a young age, too, and breathing helped, but I had to go a bit further than just focusing on breath control. What really flipped the switch for me, after I had breath control down, was elongating the initial sounds of words when I felt a bit unsteady in my speech. This gets a bit complicated for stop consonants, like b or d; luckily, drawing out the sound made when everything is "in position" helps. For b this is m, and for d it's n. Anyway, it's a "resetting" technique, forcing me to coordinate everything by holding things steady for a bare fraction of a second when they threaten to fall out of sync and cause a cascading failure. It wouldn't work without breathing, but breathing alone didn't quite do it for me. (Interestingly, relaxing wasn't quite a necessity: I never stuttered when I yelled in anger.)