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Every baby is born with flat feet. That padded, arch-free foot is completely normal in infants and toddlers. The arch develops gradually over the first several years of life as the muscles, ligaments, and bones in the foot mature.
But what happens when the arch doesn't develop? Or when your 5-year-old complains about foot pain after running? Or when you notice your child's ankles seem to roll inward? Here's what parents need to know about flat feet in children and when physical therapy can make a difference.
What Are Flat Feet?
Flat feet (also called pes planus) means the arch of the foot is lower than typical or absent entirely. When your child stands, the entire sole of the foot touches the ground rather than having a visible arch along the inside edge.
There are two main types:
Flexible flat feet. This is by far the most common type in children. The foot appears flat when standing but the arch reappears when the child stands on tiptoe or when the foot is not bearing weight. The foot is mobile and the joints move normally.
Rigid flat feet. The arch is absent regardless of position. The foot may feel stiff, and the child may have limited range of motion in the foot and ankle. This is much less common and is more likely to require medical intervention.
When Flat Feet Are Normal
Almost all children under 2 have flat feet. The arch typically starts becoming visible between ages 2-3 and continues developing through age 5-6. Some research suggests the arch can continue to develop subtly through age 10.
Flexible flat feet in a child who:
- Has no foot, ankle, or leg pain
- Can run, jump, and play without limitation
- Has normal strength and endurance
- Shows an arch when on tiptoe
generally do not need treatment. Many adults have flat feet and function perfectly well without any issues.
When Flat Feet Need Attention
Flat feet become a concern when they're causing problems. Signs to watch for include:
Pain. If your child complains of pain in the feet, ankles, shins, knees, or even hips or lower back, flat feet may be contributing. The pain is often worse after physical activity.
Fatigue. If your child tires quickly during walking or physical activity and asks to be carried more than expected for their age, flat feet might be making movement harder than it should be.
Ankle rolling (overpronation). Look at your child's ankles from behind. If the ankles roll inward and the shoes wear unevenly (more on the inside), the flat feet are affecting their alignment during weight bearing.
Avoiding physical activity. A child who resists running, jumping, or playing active games may be doing so because their feet hurt or fatigue easily.
Difficulty with shoes. Flat feet can make it hard to find comfortable shoes, and your child may complain about shoes being uncomfortable even when they fit properly.
Rigid flat feet. If the arch is absent in all positions and the foot seems stiff, this warrants a thorough evaluation by a pediatric orthopedist.
What Causes Persistent Flat Feet?
Several factors can contribute to flat feet that don't resolve on their own:
- Genetics. Flat feet run in families. If you or your partner have flat feet, your child is more likely to as well.
- Low muscle tone (hypotonia). Children with lower muscle tone may not develop the arch as quickly because the muscles that support the arch are weaker.
- Joint hypermobility. Kids who are "extra flexible" may have ligaments that are too loose to maintain the arch under body weight.
- Obesity. Extra body weight puts more stress on the foot structures, which can contribute to arch collapse.
- Neurological conditions. Some conditions affecting muscle tone or coordination, like cerebral palsy, can affect foot development.
How Pediatric PT Helps with Flat Feet
Physical therapy for flat feet focuses on building the strength and alignment patterns that support a functional arch. Your PT will:
Assess the whole picture. Flat feet don't happen in isolation. Your PT will look at your child's ankle alignment, knee position, hip strength, core stability, and walking pattern. Often, flat feet are connected to weakness higher up the chain.
Strengthen the foot muscles. Exercises like towel scrunches (picking up a towel with the toes), marble pickups, walking on different surfaces (sand, grass, gravel), and short-foot exercises help build the intrinsic muscles that support the arch.
Build hip and core strength. The position of the foot is influenced by what's happening at the hip and core. Strong hip external rotators and core muscles help maintain better alignment all the way down to the feet.
Improve balance. Balance activities challenge the foot muscles to activate and support the arch. Standing on one foot, walking on balance beams, and playing on uneven surfaces all help.
Recommend appropriate footwear. Your PT can guide you on what to look for in shoes. Generally, supportive shoes with a firm heel counter and good arch support are helpful, while completely flat shoes (like flip-flops) should be limited.
Determine if orthotics are needed. If strengthening alone isn't enough, your PT may recommend over-the-counter or custom orthotics (shoe inserts) to provide additional arch support while the muscles continue to develop.
Activities That Support Arch Development
You can support your child's foot development at home with:
- Barefoot play on varied surfaces. Walking barefoot on grass, sand, or textured mats activates the foot muscles more than walking in shoes on flat surfaces.
- Toe exercises. Picking up small objects with toes, spreading toes wide, and scrunching a towel underfoot are all great for building intrinsic foot strength.
- Balance games. Standing on one foot, walking along a line, hopping, and using stepping stones all challenge the foot and ankle muscles.
- Climbing. Activities like climbing playground structures and ladders naturally engage the foot muscles in ways that flat-surface walking doesn't.
- Avoid excessive time in supportive containers. Let your child's feet work. Too much time in rigid shoes or orthotics without opportunities for barefoot play can prevent the muscles from developing on their own.
The Bottom Line
Flat feet are part of normal development for young children, and most kids develop an arch naturally by school age. But when flat feet cause pain, fatigue, or movement limitations, physical therapy can help build the strength and alignment your child needs to move comfortably.
At Coral Care, our pediatric PTs assess foot and gait concerns as part of a whole-body approach. We look at how your child stands, walks, runs, and plays to understand what's going on and how to help. Schedule a free consultation if your child's flat feet are causing concern.


