I think how the child is doing in his current grade is a factor as well. I have a DS6 who was skipped to second grade this school year. He is the size of most kids in Kindergarten. He fit in much better this year than he did last year. He has loads of friends, and we have not had any issues since the first few weeks of school. A few girls in his class were mean to him. They worked out their issues early on, and there is no doubt we made the correct decision.

JT
DS6, DS5, DD3