How old is your child? A boy skipped first grade into my son's 2nd grade class a while back, and from what I could tell, the kids in his class (22 of them) barely noticed. The boy integrated into the class and no one treated him differently from anyone else in the class.
No one has commented on my daughter's skip, either. She's five. She goes to a very small school, though. My son (he's 10; two skips) has also been readily accepted, again at a small school (we changed schools).
Young kids seem to accept things like this pretty readily, from what I've seen. I think they're still at an age when stuff that teacher or the principal says must be the way it is, if you see what I mean.
When it comes up, I try to be very matter-of-fact about it: "They tested her, and first grade was a better fit for her."
HTH,
Val
