I've gotten alot of flack from this from my mil, but my 3year,3month old is still in a crib. Though he can climb in on his own, he never climbs out and still loves it. He sleeps great. We're getting ready to switch him to a bed, but since he still takes afternoon naps, I know when its time to go for the nap, he won't stay in a bed long enough to fall asleep. When I put him in the crib, he lays right down. My oldest went to a bed at 2.5-- but he stopped napping at that age as well.