DS is still very shy at school and we might have him repeat the 3 year old class at the recommendation of the teacher. She said the teachers convene in January to discuss class placement, but we do have to register now to secure a slot (I would register him in both the 3 yo and the 4 yo class for now so he would get a spot in either one)
He missed the cutoff this year by a week, so he was actually 2 when he started this Fall and it one of the youngest ones...so next year, he would technically be in the correct class next year if we had him repeat.
I don't mind having him repeat since he also misses the kindergarten cutoff and will start when he's almost 6. The only thing is that I'm afraid he'll miss his classmates. He's starting to form connections and will talk about the kids at home. I know he'll be looking for them when he starts next year.