Bow Legged Baby: Causes, Signs & When to Worry

It is common for parents to notice that their baby’s legs seem bowed, curved, or slightly bent outward. In many cases, a bow legged baby is completely normal, especially in the first year or two of life. Baby legs go through several natural changes as they grow, and what looks unusual at one age may be expected development at another.

Still, not all bowed legs are the same. Sometimes the shape is part of normal growth, and sometimes it can point to an underlying issue that needs medical attention. Understanding the difference can help you know when to relax and when to call your child’s doctor.

What does “bow legged” mean?

A baby is considered bow legged when the legs curve outward at the knees and the lower legs angle inward, creating a gap between the knees when the feet are together. The medical term for this is genu varum.

In young children, this can happen because the bones are still developing and the legs have not yet straightened. Many babies are born with a slight bowing of the legs, especially if they spent time curled up in the womb.

In everyday terms, a bow legged baby simply has legs that look a little curved rather than straight. The appearance can be more noticeable when a child stands with feet together, but the shape alone does not tell the full story.

For a closer look at normal growth patterns in early childhood, it can also help to read about borderline cholesterol and when numbers need follow-up, since many health concerns are best understood by watching trends over time rather than a single snapshot. The same idea applies when parents watch a child’s leg alignment.

Is bowing normal in babies?

Yes, in many cases it is normal.

Babies often start life with slightly bowed legs, and this usually becomes more noticeable when they begin standing and walking. The leg shape often changes naturally as the child grows. Over time, the legs may straighten and later even appear slightly knock-kneed before settling into a more typical alignment.

This developmental pattern is common:

• Birth to about 18 months: legs may look bowed
• Around age 2 to 4: legs often straighten
• Age 3 to 6: mild knock-knees may appear before correcting

So, a bow legged baby is often just going through a normal stage of growth. If the bowing is mild, even on both sides, and gradually improving, doctors usually watch and wait rather than treat it right away.

Parents may also notice that bowing looks more dramatic in photos or when a child stands in a certain position. That does not always mean there is a problem. What matters most is whether the shape is symmetric, painless, and trending in the right direction over time.

The same careful observation is used when doctors evaluate other body changes, such as a bounding pulse and when it may need attention, because patterns, timing, and associated symptoms often matter more than appearance alone.

Causes of bow legs in babies and toddlers

There are several reasons a baby or toddler may have bowed legs. Some are harmless and temporary, while others may need evaluation.

1. Normal development

The most common cause is simply normal growth. Babies are born with curved legs due to their position in the womb. As the child begins to bear weight, walk, and grow, the legs usually straighten naturally.

During this stage, the lower limbs are still changing shape as bones lengthen and alignment improves. A bow legged baby in this category is usually healthy, active, and otherwise developing as expected.

2. Physiologic genu varum

This is the medical term for normal bowing that occurs in young children. It is usually:

• Symmetrical on both sides
• Painless
• Not getting worse over time
• Improving as the child grows

For a bow legged baby, this pattern is often what doctors expect to see during routine growth checks.

Physiologic genu varum is not a disease. It is a growth pattern that typically resolves without treatment as the legs continue to develop.

3. Blount’s disease

Blount’s disease is a growth disorder that affects the shin bone and can cause the bowing to worsen instead of improve. It often becomes more noticeable after a child starts walking. Risk may be higher in children who are overweight or who start walking early.

Unlike normal bowing, Blount’s disease usually does not improve on its own.

One reason doctors keep an eye on a bow legged baby is to make sure the pattern stays mild and steady rather than becoming more pronounced on one side or both.

4. Rickets

Rickets is a condition caused by a lack of vitamin D, calcium, or phosphate, which leads to soft or weakened bones. Bowed legs can be one sign of rickets, along with:

• Delayed growth
• Bone pain
• Muscle weakness
• Delayed teeth development
• Other bone deformities

The MedlinePlus overview of rickets explains this condition in more detail and is a helpful reference for parents who want a trusted medical source.

Because rickets affects bone strength, a child with a bow legged baby-type appearance plus poor growth, weakness, or dietary concerns may need a closer look from a pediatrician.

5. Bone injuries or infections

Less commonly, bowed legs may be related to a past injury, fracture, or bone infection that affected how the leg healed or grew.

In these cases, the bowing may show up after an accident or illness, and it may affect only one side more than the other.

6. Genetic or skeletal conditions

Some children have bowed legs as part of a broader bone or growth disorder. These conditions are less common but may come with other signs, such as short stature or unusual body proportions.

If a bow legged baby also has other developmental or skeletal concerns, doctors may consider whether the leg shape is part of a larger pattern rather than an isolated finding.

What signs should parents look for?

If your baby’s legs look bowed, look at the overall pattern rather than just the shape alone. Normal bowing usually follows a predictable pattern and does not cause pain or functional problems.

Signs that may suggest the bowing is more likely normal include:

• Both legs look equally bowed
• The child is otherwise growing well
• There is no pain
• The bowing is mild
• The legs seem to be improving over time

Signs that may need medical evaluation include:

• One leg looks more bowed than the other
• The bowing is getting worse
• The child is limping or walking unevenly
• The child has pain
• There is swelling around the legs or knees
• The child is short for age or not growing well
• Other bone changes are present
• The bowing continues beyond the expected age range

Parents of a bow legged baby often worry most when the shape seems to change quickly. Tracking whether the legs are improving, staying the same, or becoming more curved can help your pediatrician decide what to do next.

It can be helpful to look at how your child stands and walks too. If the feet, knees, and hips all seem to move normally and the child is active without discomfort, that is reassuring. If the posture seems awkward, painful, or uneven, bring it up during a checkup.

When should you worry about bow legs?

A bow legged baby is not usually a cause for concern, but you should talk to a pediatrician if you notice any of the following:

The bowing is severe

Mild bowing is often normal, but a pronounced curve may suggest a problem.

It affects only one leg

Uneven bowing can sometimes point to an underlying bone issue or injury.

It gets worse instead of better

Normal developmental bowing usually improves with age. If the legs are becoming more curved over time, it should be checked.

Your child has pain or trouble walking

Pain, limping, or difficulty bearing weight are not typical in normal bowing.

Your child is over 2 to 3 years old and still significantly bow legged

Most children begin to straighten by this age. Persistent bowing may need evaluation.

There are signs of rickets or poor nutrition

A child with bowed legs plus weakness, delayed growth, or other bone concerns should be seen by a doctor.

Your child is at higher risk for bone problems

This includes children with:

• Premature birth
• Nutritional deficiencies
• Very rapid growth
• Family history of bone disorders
• Obesity
• Delayed walking

If you are unsure, a pediatric visit is the safest next step. A doctor can check whether the curve matches normal growth or whether it needs follow-up.

A bow legged baby who is otherwise healthy may simply need observation over time, but do not ignore warning signs if the bowing is changing or affecting movement.

How do doctors evaluate bowed legs?

If your pediatrician is concerned, they will usually start with a physical exam and growth history. They may ask:

• When you first noticed the bowing
• Whether it is getting better or worse
• Whether both legs are affected equally
• Whether your child has pain
• When your child started standing or walking
• What your child eats and whether they take vitamin D

In some cases, the doctor may recommend:

• Observation only if the bowing seems normal for age
• X-rays if there are signs of Blount’s disease or other bone problems
• Blood tests if rickets or a nutritional issue is suspected

That evaluation is especially useful when a bow legged baby has other symptoms, because the leg shape alone does not always tell the whole story.

Doctors may also compare the child’s leg alignment over multiple visits. A picture, growth chart, and careful exam over time can show whether the child is following the usual course or needs extra testing.

In a few cases, the clinician may refer your child to a pediatric orthopedist, especially if the bowing is severe, asymmetric, or persistent. The goal is to identify children who need treatment while avoiding unnecessary testing for children who are simply growing normally.

How are bow legs treated?

Treatment depends on the cause.

Normal bowing

If the bowing is mild and part of normal development, no treatment is usually needed. The doctor may simply monitor the child over time.

For many families, this is the best possible outcome: a bow legged baby who only needs routine follow-up and will likely straighten as growth continues.

Rickets

Treatment may include vitamin D, calcium, or other nutritional support, depending on the cause.

When the problem is due to low vitamin D or poor nutrition, correcting the deficiency can help protect bone health and support normal growth.

Blount’s disease

Treatment can range from bracing in early cases to surgery in more advanced cases. Early diagnosis is important because the condition can worsen as the child grows.

Bracing is most helpful when the child is young and the growth plates still have time to respond. More serious cases may require orthopedic treatment to help the legs align properly.

Other conditions

If an underlying medical or skeletal disorder is present, treatment focuses on the specific cause.

That may include managing nutrition, treating an infection, monitoring bone growth, or addressing a genetic condition. The plan depends on the overall health picture, not just the appearance of the legs.

For many families, the biggest relief is learning that a bow legged baby does not need treatment if the bowing is mild, even, and improving as expected.

Supportive care also matters. Regular pediatric checkups, balanced nutrition, and attention to walking milestones can help your child stay on track while the legs continue to develop.

Can bow legs be prevented?

Not all bowed legs can be prevented because many cases are part of normal growth. However, supporting healthy bone development may reduce the risk of some problems:

• Ensure adequate vitamin D intake
• Provide a balanced diet with calcium and other nutrients
• Follow your pediatrician’s guidance on supplements
• Attend regular well-child visits to track growth and development

Healthy feeding, sunlight exposure as advised by your clinician, and routine checkups can all support bone development during infancy.

While you cannot fully prevent every case of a bow legged baby, you can lower the risk of deficiency-related bone problems by making sure your child gets appropriate nutrition and medical follow-up.

Frequently asked questions

At what age do bow legs go away?

In most children, the legs begin to straighten between ages 2 and 4. Some mild variation is still normal after that.

Can babies outgrow bow legs?

Yes, most babies and toddlers outgrow mild bowing without treatment.

Is it normal for a bow legged baby to start walking?

Yes. Bowing does not automatically mean there is a problem with walking. Many children with normal bowing walk and develop normally.

Should I use braces or special shoes?

Usually not. Normal bowing does not need special shoes, braces, or inserts. These are generally not helpful unless recommended for a specific medical condition.

Does bow legged mean the baby has weak bones?

Not necessarily. In many cases it is simply part of normal development. Weak bones are more of a concern when bowing occurs with other symptoms or nutritional deficiencies.

How can I tell the difference between normal bowing and a problem?

Normal bowing is usually mild, even on both sides, and gradually improves. A problem is more likely if the bowing is severe, one-sided, painful, or getting worse.

Should I take pictures to track the change?

Yes, that can be helpful. A few photos taken over time in the same standing position may make it easier to notice whether a bow legged baby is improving, staying the same, or becoming more curved.

The bottom line

A bow legged baby is often completely normal, especially in infancy and early toddlerhood. Mild, symmetrical bowing usually improves on its own as your child grows. However, bowing that is severe, one-sided, painful, or getting worse should be checked by a pediatrician.

If you are unsure whether your baby’s legs are developing normally, a doctor can help determine whether simple observation is enough or whether further evaluation is needed. When in doubt, it is better to ask early and keep an eye on changes over time.

If you want one simple takeaway, it is this: a bow legged baby often just needs time, but changes in pain, balance, growth, or symmetry deserve medical attention.

To understand when a body change is likely harmless versus worth checking, many parents also find it useful to read about related concerns such as a different kind of borderline condition and how symptoms are evaluated. The specific issue is different, but the overall approach is similar: watch for patterns, timing, and whether symptoms affect daily function.

If your child’s bowing is mild, even, and improving, it may simply be part of growth. If it is severe, uneven, painful, or persistent, a pediatric evaluation can help rule out a problem and give you peace of mind.