DD had a touch of selective mutism when she started preschool, although the pedi felt she was too young to call it that. She eventually started talking after about a year at preschool, when she was about 3.5 yo. Fast forward to 2nd grade - at the behest of her teacher, her public school did quite a bit of testing b/c she was such an outlier intellectually and socially, and she ended up with a speech IEP for a form of stuttering (mazing?). We noticed it once it was pointed out to us but not before, but have reason to believe the stuttering was much worse at school. The school provided speech therapy for about 1.5 years, and the stuttering problem cleared up.
At 14 yo, she is still a huge academic outlier and a social misfit, but a very articulate one. ;-)
