to climb out of his crib, or is over 35 inches tall, it’s time to move to a toddler bed or a twin bed with a rail. your toddler can start sleeping with a thin blanket, small stuffed animal, or even a pillow at this age, and she can sleep in any position she prefers.
teens need 9 to 9 ½ hours of sleep each night! that’s about an hour more than they needed at age 10. good sleep supports brain development and physical growth spurts, so it’s important that teens have a comfortable place to sleep.
if you your teen is smaller -- under 5’5” -- a twin bed might continue 