My oldest went into a toddler bed at 11 months old. That is very young..but, she decided that she hated her crib and when I heard a loud thud one night..the lil toot had JUMPED out of her crib! That was it for me, the next day she went into the toddler bed. She hated that crib mattress, so right before she was 2 she went into a regular bed.