The age is less important than the signs. Here is when to move a child out of the crib, whether to buy a toddler bed or skip straight to a twin, and how to make the switch stick.
Most children move out of the crib somewhere between 18 months and three and a half years old, and the biggest cluster lands around two and a half to three. That range is wide on purpose. Age is the least useful signal you have. What actually decides the timing is height, climbing, and whether your child can follow a rule at bedtime.
Moving too early is the more common mistake, and it is the one that costs you sleep. A crib is a physical boundary. A toddler bed is a suggestion. Take the boundary away before a child can honor a suggestion and you have not solved a problem, you have relocated it to the hallway at 11pm.
This is the one that overrides everything else. A child who has climbed out once will climb out again, and a fall from the top of a crib rail onto a hard floor is a worse outcome than an early transition. If it has happened more than once, move them, whatever their age.
Before you do, try dropping the crib mattress to its lowest setting if you have not already, turning the crib so the lower side faces out if the design allows, and putting your child in a sleep sack, which makes it much harder to get a leg over the rail. Those buy you months sometimes. Our guide on when to lower a crib mattress covers the settings in more detail.
The standard benchmarks: a child taller than about 35 inches, or one whose chest clears the crib rail when standing with the mattress at its lowest position, has outgrown the crib. Feet touching the end is another practical cue. A standard crib mattress is roughly 27 by 52 inches, and a tall three-year-old runs out of that quickly.
A new baby who needs the crib, or night-time potty training that requires your child to get out of bed independently, both force the timing. If a sibling is coming, make the switch at least six to eight weeks before the birth so the move does not feel like an eviction.
If none of the above applies, waiting is usually the better call. Hold off if your child is not yet following simple instructions reliably, if you are mid-way through another big change (new daycare, a move, a new sibling in the first weeks), or if the crib is still working. There is no developmental prize for leaving the crib early, and a child who is content in a crib at three is not behind.
This is the real decision, and there are good arguments on both sides.
A toddler bed sits low to the ground, has built-in side rails, and uses the crib mattress you already own. Many cribs convert into one, which means the switch costs nothing and the sleep surface stays identical, which genuinely helps. The catch is lifespan: most children outgrow a toddler bed by five or six, so you are buying a two to three year solution.
A twin at 38 by 75 inches is the bed they will keep through elementary school and often well beyond. You will need a new mattress, a low frame or a mattress on a platform, and a guard rail for the first year or two. It costs more upfront and skips a step that some children find reassuring. If your child is already tall for their age, or you would rather buy once, go straight to the twin. Browse options in our twin mattress collection, and see how to choose a mattress for kids or teens for what to prioritize at each age.
A middle path worth considering in smaller LA apartments: put a twin mattress directly on a low platform or on the floor for the first year. It removes the fall risk entirely, costs less than a frame, and you can add the frame later.
Young children need a noticeably firmer surface than adults do. A plush mattress that feels wonderful to you lets a small body sink in ways that do not support a developing spine, and for children under two, firmness is also a safety consideration. Aim for firm to medium firm, and skip pillow tops at this age. Our best toddler mattress guide covers specific picks, and the crib mattress buying guide explains what carries over if you are reusing the crib mattress.
Three accessories that are worth the money:
The moment the crib goes, your child can reach everything in the room at 3am. Before that first night: anchor every dresser and bookshelf to the wall, cover outlets, move lamps and cords out of reach, secure or remove blind cords, and check that windows are locked. Many parents add a gate at the bedroom door rather than closing it, which keeps the child in a safe space without the door being shut.
Keep everything else identical. Same bedtime routine, same sheets if you can, same comfort object, same room. The bed is the only variable you want to change that week.
Let your child help make the bed and pick the pillowcase, so the bed is theirs rather than something that happened to them. Then expect the testing. Most children get out of bed repeatedly for the first week or two. The method that works is boring consistency: walk them back, minimal talking, no negotiation, every single time. It takes several nights and it works. Reacting with attention, positive or negative, is what extends it to several weeks.
If the first few nights go badly, going back to the crib for a few weeks is not a failure. Try again in a month.
Most families make the move between 18 months and three and a half years, most commonly around two and a half to three. Age matters less than readiness: climbing out of the crib, outgrowing it physically, or a family change like a new baby are the signals that should drive the timing.
Move them once they have climbed out more than once, once they are taller than about 35 inches, or once the crib rail sits below their chest when standing with the mattress at its lowest setting. Any of those means the crib is no longer containing them safely.
No. A toddler bed uses a crib-size mattress, roughly 27 by 52 inches. A twin is 38 by 75 inches, considerably wider and about two feet longer. A toddler bed frame will not accept a twin mattress.
Yes, in almost every case. Toddler beds are built around the standard crib mattress, which is one of the main reasons the transition is cheap. If your crib converts to a toddler bed, the mattress you already own is the mattress you keep using. Check the fit is snug, with no gap you could fit more than two fingers into along the edges.
Usually between five and six years old, or sooner if your child's feet reach the end. The 52-inch length is the limiting factor. If they are close to that already, skipping the toddler bed and going straight to a twin saves you buying twice.
Expect two weeks of testing and respond the same way every time: walk them back to bed calmly, say almost nothing, and leave. Keep the rest of the bedtime routine unchanged, and consider a gate at the door instead of closing it. Consistency shortens the phase. Negotiating extends it.
If you are going straight to a twin, come lie on a few with your child. Kids have firmness opinions and it takes about a minute to find out what theirs are. All five of our LA showrooms carry twin mattresses at every firmness, and we can usually get one to you the same day: see our delivery options. Not sure where to start? Our sleep quiz narrows it down in about two minutes.
Skip the comparison shopping. Answer a few questions and we'll narrow it down to the mattresses that actually fit your sleep style.
Buying guides and sleep advice, no email signup required.
