My son is 2 years and 4 months. He still sleeps in a crib. I am going to wait as long as possible to move him to a bed. He si comfortable in his crib, and he stays in there at night, eventhough he knows how to get out. I am not one to thin kyou should rush it. I would wait until they ask for it. Eventually, they are going to want to move to a big bed. Until then, whatever works for you.