Most children start attempting to run between 18 months and 2 years old. By their second birthday, the majority of toddlers can run, though their form looks nothing like an adult’s. The progression from first wobbly steps to actual running takes several months of practice, and the timeline varies from child to child.
The Typical Timeline
Walking comes first. By 18 months, most children walk without holding on to anyone or anything. Around this same window, toddlers begin “trying out running,” as developmental guidelines describe it. This early running is more of a fast, lurching walk with stiff legs and arms held wide for balance. It doesn’t look graceful, and falls are frequent.
By age 2, running is listed as a standard milestone. Children’s Hospital of Philadelphia describes the typical 2-year-old as “talking, walking, climbing, jumping, running and bursting with energy.” So the transition from first steps to first runs generally spans about six months, roughly from 18 to 24 months, though some children get there a bit earlier or later.
What separates running from fast walking is a “flight phase,” a brief moment when both feet are off the ground at the same time. During walking, one foot is always touching the floor. That split second of airtime is the biomechanical line between the two, and it’s the reason running demands more strength, balance, and coordination than walking does.
What Has to Develop First
Running isn’t just walking faster. Your child’s body needs several systems working together before it becomes possible: strong enough leg muscles to push off the ground and absorb landing, bones sturdy enough to handle the impact, and a nervous system mature enough to coordinate rapid, alternating leg movements. Balance, body awareness, and reaction time all play a role too.
Toddlers have a high center of gravity relative to their body size, with a proportionally large head and short legs. This makes balance harder. Their leg muscles are still developing the stiffness and spring needed to bounce off the ground efficiently. Research in the Journal of Physiology found that the “bouncing” mechanics of running change substantially between age 2 and age 12, largely because body mass increases more than fivefold while the elastic stiffness of muscles and tendons develops on its own timeline. Young children compensate for their shorter legs by taking more steps per second and swinging their limbs through a wider range of motion.
Before running, most toddlers hit a few prerequisite milestones: walking smoothly on flat ground, climbing on and off furniture without help, and pulling toys while walking. These all build the leg strength and balance control that running requires.
How Running Matures After Age 2
A 2-year-old’s run is choppy and flat-footed, with arms out to the sides rather than swinging forward and back. Over the next few years, running form gradually improves. By age 4, most children can run around obstacles with reasonable control. By age 6, coordination has developed enough for activities like jumping rope and walking on a balance beam, movements that require the same kind of complex timing that smooth, efficient running depends on.
The leg angle during ground contact starts out slightly wider in young children and narrows over the years, eventually reaching adult proportions around age 12, when leg length hits about 95% of its final measurement. Until then, kids rely on quicker steps rather than longer strides to move fast. The interaction between their feet and the ground, how hard they push off and how they absorb impact, stays surprisingly consistent across ages, suggesting the basic mechanics of running are somewhat hardwired even if the refinement takes years.
Barefoot vs. Shoes for Early Runners
If you’re wondering whether shoes matter at this stage, research suggests that for very young runners, less is more. A study on preschool-age children found that 3-year-olds running barefoot experienced significantly lower impact forces compared to running in standard shoes (7 to 11% lower) or even minimalist shoes (3 to 7% lower). Interestingly, minimalist shoes did not mimic barefoot conditions for these young children and actually increased loading on their joints compared to going shoeless. By the time kids were a bit older, the differences between footwear conditions disappeared.
This doesn’t mean shoes are harmful, but it does suggest that letting toddlers practice running barefoot on safe surfaces may be a natural way to support early motor development. When shoes are needed for protection outdoors, flexible soles that allow the foot to move naturally are a reasonable choice.
When to Be Concerned
Because every child develops at their own pace, a few months’ variation is completely normal. The bigger red flag is not walking, not running. If your child shows no signs of walking by 18 months, that’s a recognized point at which a developmental evaluation is worthwhile. Specialists at pediatric centers like Gillette Children’s note that consistently lagging behind peers across multiple motor skills, not just one, is the pattern that warrants a closer look.
If your child is walking well but hasn’t started running by age 2, that alone isn’t necessarily a concern. But if they also struggle with climbing, seem unusually unsteady, or have difficulty with other physical milestones for their age, a pediatric developmental specialist or physical therapist can assess whether something specific is going on. Early evaluation gives children the best chance to close any gaps in motor skills while their brains and bodies are most adaptable.