I had this problem as a kid. There isn't much info about it online. I might have grown out of it but I am not sure. I still talk fast and I sometimes still type something else while I am thinking of something else in my head I am wanting to say and sometimes when I talk, it doesn't always come out right than I intended. But then again it says clutterers are not aware of their disorder so if one becomes aware would that mean they wouldn't have it anymore? I still get moments where I want to say something and I have all these words in my head but can't get all of them out. But then again there is some overlap with ASD. I could relate to this boy in the video here. (scroll down for video)
http://www.stutteringsource.com/blog/fo ... ycCKDArLIU
Kids would say I was skipping words and reading out loud it still hard for me because I have to work harder at reading slowly and to not slur my words and to skip words and to slow my brain down as I read. So I tell my son I need a break from reading because my mouth is sore and my brain.
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Son: Diagnosed w/anxiety and ADHD. Also academic delayed and ASD lv 1.
Daughter: NT, no diagnoses. Possibly OCD. Is very private about herself.