Question: how long should baby sleep in crib?
Answer: When to Transition to a Toddler Bed Over 90% of 18-month-olds sleep in a crib, but that gradually drops to about 80% at 2 years and 40% by 3 years of age. After the first birthday, it's wise to put the mattress all the way down and make sure your tot doesn't have toys or bumpers to climb on.