Moving your tot to a toddler bed or big-kid bed with rails may be on the horizon if she's hit 35 inches in height or her crib's side rail comes up to about mid-chest level when she’s standing in it.

While there's no hard-and-fast age for when to move your child to a bed, little ones generally make the switch from crib to toddler bed any time between 18 months and 3 1/2 years old, ideally as close to age 3 as possible, according to guidelines from the American Academy of Pediatrics (AAP). When can your child sleep in a toddler bed?