J.S.
We just moved our nearly 3.5 year old about two weeks ago from the crib to the toddler bed. We'd been asking her about it since before she turned three and she wanted nothing to do with it - I finally figured out that she didn't want to have a completely different bed - we had a toddler conversion kit for her lifetime crib so it's exactly the same crib with a smaller 3/4 rail - once I told her it was just a different rail she agreed to try it and has been doing fine. Knock on wood. I didn't see any reason to rush it! Good luck!