Disclaimer - I'm not a Mom!

I would contact the school at your new town, and see if you can talk it over with the kindergarden teacher there. That teacher may have an opinion!

My niece is three, and is very verbal and smart (I swear it's not just my bias!)... she is in daycare a few days each week, and they moved her in with the four-year-olds because she didn't want to have to keep playing with the "babies."

Obviously - this is your kid, so you need to make the decision. I was the youngest in my class all through school, and it was fine... I didn't feel any problems or differences developmentally compared to the older kids in my grade.

Good luck!