Hello, I’m 22M so still remember a lot of things my parents would do to ‘help’ me. My mum sheltered me for most of my childhood. Stuff like making phone calls for me, saying what I wanted at restaurants, basically just being my voice. This is probably pretty normal parenting but I wish that they pushed me a bit more around strangers by making me ask for my food at the restaurant, making me call my gran, etc. I should of been thrown into the deep end a bit more. My dad on the other hand (divorced parents) would try push me by doing all the opposites to my mum but by this time, the anxiety had already began. I got told by someone a couple years ago that anxiety and excitement are actually the same sensation so if that’s true, that’s why your son stutters more when excited. Which would also suggest that he will stutter when anxious. So I would personally (speaking as if I was your son), try make him speak independently in social situations, make him say his order at restaurants, ask him to call other family members, do as much as you can to get him talking. This is obviously if you’re not doing this already. Again, speaking from my own point of view, this would have helped me get used to my stutter and not make me shy away from speaking. I would have accepted my stutter quicker too This is only my experiences so not everyone will agree. I hope you and your son are doing well!