M.S.
My daughter was 17 1/2 months old. She climbed out of the crib at that time. My other daughter was 19 months old when we moved her because she was climbing out of th crib. We tried the toddler bed but didn't have much luck with it so we went straight to a full size bed. We went thru a few nights of putting them back to bed several times but it didn't take too long to get them used to it.