Most toddlers start climbing between 8 and 12 months old, often before they can walk. What begins as pulling up onto a low chair or couch cushion quickly evolves into scaling stairs, playground structures, and anything else within reach. Climbing is one of the earliest and most important gross motor milestones, and it develops in a predictable sequence over the first few years of life.
The Climbing Timeline: 8 Months to 5 Years
Babies as young as 9 months may start pulling themselves up onto low furniture like chairs and sofas. At this stage, they’re using upper body strength more than leg coordination, and the movements look more like hauling than actual climbing. Nearly all early climbing starts this way, with babies treating every piece of furniture as a challenge to conquer.
Stair climbing follows shortly after. Most infants master going up stairs at around 11 months, typically on hands and knees. Coming back down takes longer, with most children figuring out descent by about 12 and a half months. The gap makes sense: going up is instinctive, but reversing direction requires more spatial awareness and impulse control. Ninety-four percent of babies crawl upstairs the very first time they attempt it independently.
By age 2, the CDC notes that most children can walk up a few stairs (not climb them on all fours) with or without help. They’re also running and kicking a ball at this point, which reflects the leg strength and balance that makes upright stair walking possible. Between ages 3 and 4, children can run, jump, and climb well. By 5, most kids are confident, capable climbers on playground equipment and similar structures.
What Makes Climbing Possible
Climbing isn’t a single skill. It requires core strength to hold the body upright against gravity, upper and lower body coordination to alternate hand and foot placement, and enough grip strength to hold on. These physical prerequisites build on each other. A baby who can’t yet sit independently, for instance, doesn’t have the trunk stability needed to pull up onto a couch.
The sensory system plays a quieter but equally important role. The vestibular system, located in the inner ear, tells the brain where the head is positioned relative to gravity. This is what allows a toddler to know they’re tilting sideways on a climbing structure or leaning too far forward on stairs. It also stabilizes their visual field so they can look at their hands and feet while moving. Climbing is one of the richest activities for developing this system because it requires constant adjustments in multiple directions. Each time a toddler climbs, they’re building balance, spatial awareness, and the ability to coordinate smooth, purposeful movements.
Crib Climbing: A Common Milestone
One of the first climbing feats that alarms parents is the crib escape. Toddlers typically start attempting to climb out of the crib between 18 months and 2 years old, though some adventurous or taller children try earlier. Once a toddler can swing a leg over the rail and lower themselves down, the crib is no longer a safe sleep space. A fall from crib height can cause serious injuries.
If your toddler is climbing out of the crib, that’s generally considered the clearest signal to transition to a toddler bed. Before making the switch, check the crib’s listed weight and height limits to make sure your child hasn’t outgrown them. The transition also goes more smoothly when a child is developmentally ready to understand basic safety rules, like staying in bed at night.
Furniture Safety While They Climb
Toddlers don’t distinguish between a playground climbing wall and a bookshelf. Any vertical surface with footholds is fair game, which makes unsecured furniture genuinely dangerous. Between 2000 and 2022, the Consumer Product Safety Commission documented 199 child deaths from clothing storage units (dressers, chests of drawers) tipping over. Over a 16-year period, an estimated 84,100 tip-over injuries involving these units were treated in emergency departments, averaging about 5,300 per year.
In response, the STURDY Act became law in December 2022, creating mandatory stability standards for dressers and similar units. New standards require testing on carpet, with loaded and open drawers, and with forces simulating a child up to 60 pounds pulling or climbing on the unit. But these standards only apply to newly manufactured furniture. For anything already in your home, the single most effective step is anchoring dressers, bookshelves, and televisions directly to the wall with furniture straps or brackets. The CPSC recommends this for every home with children under 6.
Beyond anchoring, keep climbable objects away from windows. Move chairs and step stools that a toddler could use to reach high surfaces. Place heavier items on lower shelves so top-heavy furniture is less likely to tip. These steps don’t stop climbing, but they make the environment more forgiving when it happens.
Signs of a Motor Delay
Every child develops at their own pace, and a few weeks’ difference in reaching milestones is normal. But there are specific skills that serve as red flags when they’re absent in certain age windows. For children between 24 and 36 months, researchers have identified three sensitive indicators of gross motor delays: the ability to walk backwards, the ability to stand up from lying on their back, and the ability to hop on one foot at least twice. Children who couldn’t walk backwards at their initial assessment typically caught up within about 5 months. Those who couldn’t stand from a lying position took closer to 8 months. Hopping on one foot took the longest to develop, with a median catch-up time of 11 months.
If your toddler isn’t pulling to stand by 12 months, isn’t attempting to climb stairs by 15 to 18 months, or seems significantly behind peers in balance and coordination, those patterns are worth raising with a pediatrician. Early detection of motor delays, especially in the first few years, opens the door to interventions that are most effective when started early. Some motor difficulties also appear alongside broader developmental differences, so a professional evaluation can provide a fuller picture of what’s going on.