My child's legs are bowed like an O. Is that okay?

If it looks like a ball could roll between your toddler's legs as they waddle along

Key points in 30 seconds

1. Bow legs in toddlers are mostly not a disease but part of growing up.
2. Children's legs grow in the order O shape → straight → X shape → straight. It's also common at age three or four for the knees to touch while the ankles stay apart.
3. But if it doesn't lessen or gets worse after age 2–3, if only one leg is bowed, if your child is clearly shorter than peers, or if they complain of pain or limp, don't just watch it; get it checked first.
4. While you watch, take a front-view photo in the same spot every 3 months. It shows the direction of changes you couldn't see by eye.
5. There's no evidence for rushing into corrective shoes or braces for toddlers. Plenty of barefoot walking, running and playing is the best exercise.

What we often hear

• "Their ankles touch, but there's a round gap between the knees."
• "If we don't correct it now, will it stay like this for life?"
• "When I search, all I get are ads for braces and corrective shoes."
• "The grandparents say it'll straighten out as they grow. Can I just trust that?"

You watch your toddler, who has just started walking, from behind, and there's a round gap between their legs.

The waddling is adorable, but then the worry hits: are those bow legs? When you search, ads for correction products come up one after another, and the worry only grows.

To give you the answer first: at this age, O-shaped legs that look similar on both sides are usually just a stage of growing up.

Children's legs naturally start out in an O shape

In the womb, a baby spends its time with its legs curled up. So at birth the legs curve outward, and the O shape is often still clear around the time they start walking. This curve straightens on its own as the child walks, runs and grows.

What comes next is the interesting part. Legs that straighten around age 2 don't stop there; this time they lean toward an X shape. A three- or four-year-old standing with knees touching and ankles apart is actually common. Then, around the time they start elementary school, the legs settle into a straight shape similar to an adult's.

Age	Commonly seen shape
Birth to starting to walk	O shape
Around age 2	Straight
Age 3–4	Toward an X shape
Around starting elementary school	Straight again, similar to an adult

The O shape you see now is most likely the first stretch of this path. So what's needed at this stage is not correction but watching carefully. If you're worried about a child who has moved into an X shape, see the knock-knees post as well.

But there are cases where watching isn't enough

There are signs that a child has strayed from this path. If even one applies, don't brush it off with "it'll straighten out as they grow."

• The O shape isn't lessening, or is even getting worse, after age 2–3
• Only one leg is bowed, or the two sides are noticeably different
• Your child is clearly shorter than peers
• Your child complains of pain, limps, or doesn't want to walk much

These signs may mean we need to check for a problem at the part of the bone where it grows (the growth plate), or with nutrients needed to build bone (such as vitamin D).

At this point, it's not the time to look into corrective exercises or braces. Checking the bones with imaging and getting the care your child needs comes first. When we see these signs, we don't bring up correction either; we first refer you to the radiology clinic on the 2nd floor of the same building, which we work in partnership with, and to specialist pediatric care.

How to "watch" properly

Watching vaguely only makes the worry grow. When you see your child's legs every day, it's hard to notice small changes by eye.

That's why we recommend turning watching into recording.

First, take a photo once every 3 months. In the same spot, stand your child up barefoot with their ankle bones lightly touching, and take a photo from the front.

Second, measure the gap between the knees with your fingers. It helps to write down how many fingers fit between the knees, along with the date.

Third, compare them side by side. Lined up side by side, the photos show whether it's lessening, staying the same, or different on one side. If care ever becomes necessary, this record will also be the best information to bring.

One more thing: rushing to use corrective shoes or braces for toddlers isn't an established, evidence-based approach during normal development. Plenty of barefoot walking, running and playing. For a child, that's the best exercise.

What we do is one of two things

Either we reassure you, or we refer you right away.

First, we ask and measure. We ask when your child started walking, whether the bowing is lessening or increasing, how one side compares with both, and whether anyone in the family has had something similar. Then we stand your child up, measure the symmetry of both legs and the gap between the knees, and keep those as baseline values.

If it looks within the range of normal development, we don't recommend a correction program. We tell you what changes are normal from here, which signs mean you should come back, and how to keep records, and we set the next check-up date together.

If we see the signs above, we refer you right away, connecting you with imaging and the care your child needs.

We believe the most honest things we can do about a child's legs are two: not starting treatment that isn't needed, and not putting off checks that are.

If the legs still look apart well after school age, that's a different situation. We've written about that case separately in the post on bow legs in children.

What changes

Instead of the worry of searching for photos of children's legs every night, the joy of seeing the path your child is growing along in photos taken every 3 months.

Parents watching that path with peace of mind. That's what we hope for.

When and how fast the legs straighten differs from child to child.

Today's takeaway

Bow legs in toddlers are usually something to watch and record rather than correct. But if even one of the four signs above applies, getting checked comes first.

There's one thing to try today. Stand your child up barefoot, ankles together, and take one front-view photo, with the date. That becomes your first baseline.

If any of the four signs is on your mind, bring that photo with you. We'll help you sort out whether it's something to watch or something to check. We're open on weekends too, so it's easy to come in with your child.

The evidence on bow legs in adults and correction is in the bow legs evidence post, and the order in which we measure and work on posture is laid out in our treatment guide.

For questions or appointments, message us in English through the messenger at the bottom right of the page, or call +82-53-716-1175.