Most babies start climbing between 9 and 12 months, right around the time they learn to pull themselves to a standing position and cruise along furniture. By 15 months, climbing onto furniture is a standard developmental milestone, and by 18 months, most toddlers can get onto an adult-sized chair without help.
Climbing doesn’t appear out of nowhere. It builds on a sequence of motor skills your baby has been practicing for months, and it continues developing well into the preschool years. Here’s what to expect and when.
The Skills That Come Before Climbing
Before a baby can climb, they need several physical abilities working together. Between 9 and 11 months, most babies can move between lying down and sitting without help, crawl on hands and knees, pull to standing with one foot leading, and cruise around furniture while holding on. These are the building blocks. A baby who is cruising along the couch is already doing a basic version of climbing: shifting weight, gripping with their hands, and coordinating upper and lower body movements at the same time.
Once babies can take independent steps (a 10 to 12 month milestone for many), they start looking for new physical challenges. Low furniture, stairs, and anything with footholds become irresistible. This is completely normal and driven by the same motor development that got them walking.
Climbing Timeline: Month by Month
Every child moves at their own pace, but the general progression looks like this:
- 7 to 9 months: Babies who can crawl may attempt to crawl up stairs on all fours. They’ll almost always try going up before figuring out how to come down.
- 9 to 12 months: Pulling to stand and cruising lead to early climbing attempts on low surfaces like couch cushions, ottomans, or bottom stair steps.
- 15 months: Climbing on furniture is a recognized developmental milestone.
- 18 months: Most toddlers can get onto an adult chair without assistance.
- 19 to 24 months: Walking up and down stairs with support (holding a railing or your hand) becomes expected. The CDC lists “walks up a few stairs with or without help” as a milestone by age 2.
- By age 4: Children typically go up and down stairs independently without holding on. Going up usually comes first, with going down following within the same year.
Why Climbing Matters for Development
Climbing isn’t just a physical skill. It engages multiple parts of the brain at once, building spatial awareness, hand-eye coordination, and working memory. When a toddler figures out where to place a hand or shift a foot on a play structure, they’re using proprioception, their brain’s sense of where their body is in space. This same sense helps them navigate uneven ground, judge distances, and eventually do things like catch a ball or ride a bike.
Climbing also requires problem-solving in real time. A child on a climber has to adapt to changing angles, estimate distances between surfaces, and coordinate both sides of their body simultaneously. These aren’t skills you can teach with a toy on the floor. They develop through the physical experience of moving through three-dimensional space.
When Babies Climb Out of the Crib
One of the first climbing milestones that catches parents off guard is the crib escape. Some babies attempt this as early as 10 or 11 months, as soon as they learn to pull to standing. More commonly, it happens during the toddler stage, somewhere between 18 months and 2 years.
The American Academy of Pediatrics says a toddler has outgrown their crib when they’re taller than 35 inches or when the crib railing hits at the middle of their chest while standing. If your child is climbing out, regardless of age or height, it’s time to switch to a toddler bed. A fall from the top of a crib rail is a real injury risk, and no amount of lowering the mattress will stop a determined climber for long.
Keeping a Climbing Toddler Safe
You can’t stop a toddler from climbing, and you shouldn’t try. What you can do is control the environment so their climbing is as safe as possible.
Furniture tip-overs are the most serious hazard. The Consumer Product Safety Commission has documented 199 child deaths from dressers and other clothing storage units tipping over between 2000 and 2022, plus an estimated 5,300 emergency room visits per year from tip-over injuries. Dressers, armoires, and wardrobes are the biggest culprits, especially when drawers are open and a child uses them as steps. Anchor all tall furniture to the wall with anti-tip brackets. This is a simple fix that takes minutes.
For stairs, a gate at both the top and bottom works well during the crawling and early walking stages. But toddlers also need supervised practice on stairs so they can develop the skill safely. Letting them crawl up a few carpeted steps with you right behind them builds confidence and coordination faster than keeping stairs completely off-limits until they’re older.
Signs of a Motor Delay
Not all children hit milestones on the same schedule, and a few weeks or even a couple of months of variation is perfectly normal. But certain patterns by specific ages are worth paying attention to. By 12 months, a baby who isn’t crawling, has poor balance when standing, has unusually stiff legs when trying to get upright, or needs to use their hands just to stay sitting may have a gross motor delay worth evaluating. By age 3, significant trouble with stairs and balance can also signal a concern, though serious motor delays are usually noticeable well before 18 months.
If your child seems interested in climbing but just hasn’t gotten there yet, that’s different from a child who shows no interest in pulling up or moving vertically at all. The desire to climb, even clumsily, is a good sign that the underlying motor development is on track.