I will be looking at this thread for answers too. At least with skipping K, none of his school peer group will really know him as being in another grade. I imagine once he starts no one will bat an eye at it. He won't even need to tell people he didn't go to K. I would just suggest to him that if the teacher makes any references to K such as write a story about your favorite time in K, he just knows to write about PK. My DD7 is skipping 2nd and moving up in the fall. We have suggested she not tell people she is skipping, but rather when asked what grade she is in to just reply 3rd. We are hoping to keep it pretty low key as I think that will make the transition easier for her.