Most children move from a crib to a toddler bed between 18 months and 3.5 years, but age is not the trigger. Make the switch when your child climbs out of the crib, when they are about 35 inches tall, or when the crib rail sits below their chest while standing. Until then, a crib is the safest place for them to sleep.
The real signs it is time
- They climb out, or try to. This is the most important sign. A child who can climb out of a crib can fall, so safety now favors a low toddler bed.
- They reach about 35 inches tall. Many crib makers set this as the height limit for safe crib use.
- The crib rail is below their chest when they stand inside it, which makes climbing out easy.
If none of these apply, there is no rush. A crib keeps a younger child contained and safe, and moving too early can lead to a toddler wandering at night.
Do not switch too early
A toddler bed gives a child freedom to get up on their own, which a younger toddler may not be ready to handle safely. Unless your child is climbing out, staying in the crib a little longer is usually the safer choice.
Choosing a toddler mattress
Many toddler beds use the same size mattress as a crib, so you may be able to reuse a firm crib mattress if it is still in good condition. A toddler mattress can be slightly less firm than an infant mattress but should still be supportive. See our toddler mattress picks, and revisit firmness in our crib mattress firmness guide.
Make the room safe first
Before the switch, anchor furniture to the wall, cover outlets, and use a baby gate if needed, since your child can now get out of bed and explore. For the full sleep-safety picture, see our safe sleep guidelines and crib mattress safety guide.
Note: This is general information, not medical advice. Follow the current American Academy of Pediatrics (AAP) safe sleep recommendations and your pediatrician’s guidance for your child.
Frequently asked questions
What age should I move my child to a toddler bed?
There is no single right age, but most families transition between 18 months and 3.5 years. The best trigger is behavior and size, especially climbing out of the crib, rather than a birthday.
Can I use the crib mattress in a toddler bed?
Often yes. Many toddler beds take a standard crib mattress, so a firm crib mattress in good condition can carry over. Replace it if it is worn, sagging, or no longer firm.
Is it safe to leave my child in a crib past age 3?
Yes, as long as they fit comfortably and cannot climb out. A crib is safe until a child outgrows it or starts climbing, at which point a toddler bed is safer.
