It would be interesting to know what the change was that made him slow down academically this year? Was he at a Montessori for kindergarten? Did he go from 0 to 2nd grade reading level in kindergarten, or was he reading before kindergarten?

Regardless, I don't really think there is any compelling reason to hold this little guy back at all! I love delbows response. And I still think a full assessment for him might be useful. Espeically if they're going to stick it out at this school he's at. They may need some ammo. I bet if he were 6 months older and doing the same thing academically and socially, they wouldn't try to pull this on him.