Most toddlers start running between 18 and 24 months old, roughly six months after they take their first independent steps. The CDC lists running as a milestone children should reach by age 2. But those early attempts look nothing like the smooth, coordinated running you’d see in an older child. True running with mature form continues developing well into the preschool years.
How Running Differs From Fast Walking
What separates running from walking isn’t speed. It’s a “flight phase,” a brief moment when both feet leave the ground at the same time. During walking, at least one foot always stays in contact with the surface. When your toddler first picks up the pace, they’re often doing a hurried, stiff-legged walk rather than actually running, because they haven’t yet developed the strength and coordination to launch themselves off the ground with each stride.
You’ll notice the real transition when your child’s movement starts to include that tiny airborne instant between steps. It can be subtle at first. Their arms may stay stiff at their sides, their steps may be short and choppy, and they’ll probably topple over more than you’d like. That’s all normal. The flight phase gets longer and more confident over time.
Stages of Running Development
Pediatric movement specialists describe three broad phases children pass through as their running matures:
- Initial phase (roughly 18 to 24 months): No true flight phase yet. At least one foot stays on the ground. The legs are stiff, the stride is short, and the arms don’t swing in rhythm with the legs. This looks more like a controlled forward fall than running.
- Transition phase (roughly 2 to 3 years): A visible flight phase appears. Steps get longer, arms start to move more freely, and the child can change direction without stopping entirely. Falls become less frequent.
- Mature phase (around age 3 and beyond): Wider steps, a clear and longer flight phase, coordinated arm swing, and the ability to speed up, slow down, and stop with control. By this stage, most kids look like they’re genuinely running.
These ages are approximate. Some children move through these stages faster, others slower. The sequence matters more than the exact timing.
What Needs to Happen Before Running
Running builds on several skills your child has been developing since infancy. They need enough core strength to hold their trunk stable while their legs move independently. They need balance refined enough to recover from that split second when neither foot touches the ground. And they need confident, steady walking for several months before their body is ready to add speed and a flight phase.
Most children walk independently somewhere between 9 and 15 months. The six-month gap between walking and running gives their muscles, joints, and nervous system time to adapt. During that window, you’ll see your toddler practicing the building blocks: walking faster, stopping and starting, stepping over small objects, and navigating uneven ground. All of this lays the groundwork for running.
Encouraging Your Toddler to Run
The single best thing you can do is give your child space and varied terrain. Parks, backyards, beaches, and grassy hills all challenge a toddler’s balance and coordination in slightly different ways. Sandy, rocky, and sloped surfaces force their muscles to adapt, which builds the stability running demands. Flat indoor floors are fine for early walking, but outdoor play on natural ground accelerates gross motor development.
You don’t need structured activities. Chasing games, kicking a ball, or simply letting your toddler move freely in a safe outdoor space gives them plenty of practice. Barefoot time on soft surfaces like grass also helps, because it strengthens the small muscles in the feet and gives better sensory feedback than shoes do.
When Late Running Could Signal a Concern
There’s a wide range of normal. Some kids run confidently at 17 months, others not until closer to their second birthday. If your child is walking steadily by 18 months and making attempts to move faster, they’re likely on track even if they haven’t hit a true run yet.
Signs worth paying attention to include difficulty staying balanced during walking or running, an unusual gait pattern that doesn’t improve over weeks, consistently favoring one side of the body, or a lack of interest in moving and exploring. The American Academy of Pediatrics notes that children with delayed gross motor skills like rolling, sitting, or walking may benefit from a physical therapy evaluation. The same applies if running hasn’t emerged by well past 24 months, especially if other movement milestones were also late. Your pediatrician can help distinguish between a child who’s simply taking their time and one who might benefit from extra support.