Bowed Legs (Genu Varum) in Babies & Toddlers
Content reviewed against published AAP, NIH, Mayo Clinic guidelines
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Bowed legs (genu varum) — where the knees curve outward when standing with feet together — are a normal part of development in babies and toddlers. Almost all babies are born with some degree of bowing due to their folded position in the womb. This typically straightens by age 18-24 months and may even transition to mild knock-knees by age 3-4. Persistent, worsening, or asymmetric bowing may need evaluation.
Key takeaways
- Bowed legs (genu varum) — where the knees curve outward when standing with feet together — are a normal part of development in babies and toddlers.
- Most common cause: Physiologic bowing (normal developmental variant)
- Emergency: Sudden onset limb deformity after injury
- Home care: Reassurance: physiologic bowing is normal and resolves without treatment in most children
Possible Causes
When to Seek Help
Emergency — Call 911 or go to ER:
- Sudden onset limb deformity after injury
Urgent — See doctor today:
- Severe progressive bowing with pain or functional limitation
- Bowing with signs of rickets (swollen wrists, poor growth, seizures from low calcium)
Same-day appointment:
- Bowing that is clearly worsening over time (take photos to document)
- Asymmetric bowing (one leg more curved than the other)
- Bowing persisting or worsening after age 2
- Bowing with lateral thrust of knee during walking
Monitor at home:
- Symmetric mild-moderate bowing in a child under 2 (physiologic)
- Bowing that is gradually improving over time
- Known physiologic bowing with scheduled follow-up
- Mild bowing in new walker (under 18 months) that is stable
By Age
0-2 months
Normal: All newborns have bowed legs from intrauterine positioning. This is completely normal and expected. Legs may appear quite curved.
Worry if: Very severe bowing present at birth (skeletal dysplasia concern). Asymmetric bowing (one side much more than other). Short limbs disproportionate to body.
2-6 months
Normal: Bowing remains normal and expected. Legs may still appear significantly curved when baby is held upright.
Worry if: Progressive worsening of bowing. Asymmetric bowing. Signs of rickets (widened wrists, delayed fontanelle closure, poor growth).
6-12 months
Normal: Bowing should begin to gradually improve. Mild to moderate symmetrical bowing is still normal at this age. As baby begins to stand, bowing becomes more noticeable but is expected.
Worry if: Bowing that appears to be worsening rather than improving. Asymmetric bowing. Bowing with wrist widening or bony swelling (rickets). Bowing with poor growth or failure to thrive.
1-3 years
Normal: Physiologic bowing typically resolves by 18-24 months. Slight bowing at 12-18 months is still normal. By age 2-3, legs should be straight or beginning slight knock-knee pattern.
Worry if: Bowing worsening after 18 months (Blount disease concern). Severe bowing affecting walking. Asymmetric bowing. Bowing persisting beyond age 2-3 years. Pain with bowing. Short stature with bowing.
Home Care
- Reassurance: physiologic bowing is normal and resolves without treatment in most children
- Do NOT use braces, special shoes, or corrective devices for normal physiologic bowing — they do not help
- Take periodic photos (every 2-3 months) from the same angle to document improvement or changes
- Ensure adequate vitamin D intake (400 IU daily for all breastfed infants, as per AAP)
- Provide a diet with adequate calcium for bone health
- Allow normal activity — physiologic bowing does not limit play or development
- Ensure baby/toddler received vitamin D supplementation from birth if breastfed
- If concerned about progression: measure the gap between knees when ankles are touching (intercondylar distance) over time
Frequently asked questions
What causes bowed legs (genu varum)?
When is this an emergency?
What can I do at home?
When should I call the doctor?
Sources
All content follows our editorial policy and is reviewed against published clinical guidelines.
2,705 evidence-based guides6 authoritative medical sources
Related Symptoms
Bottom line
Most cases of bowed legs (genu varum) in babies are not emergencies. However, seek immediate care if sudden onset limb deformity after injury.
Trust your instincts. If something feels wrong, reach out to your pediatrician. Worrying about your baby means you care — that is a good thing.