My Toddler Has Severe Knock Knees
Medically reviewed by Dr. Sarah Chen, MD, FAAP · Board-Certified Pediatrician
Content reviewed against published AAP, NIH, CDC guidelines
Last reviewed:
Your baby's physical development is unique, and concerns about my toddler has severe knock knees, here is what you need to know.
The short answer
Mild knock knees are a normal developmental phase that peaks around age 3-4 and typically resolves by age 7-8. However, severe knock knees (where the distance between ankles is greater than 8-10cm when knees touch), asymmetric knock knees, or knock knees that worsen after age 4 should be evaluated by a pediatric orthopedist.
Key takeaways
- Mild knock knees are a normal developmental phase that peaks around age 3-4 and typically resolves by age 7-8. However, severe knock knees (where the distance between ankles is greater than 8-10cm when knees touch), asymmetric knock knees, or knock knees that worsen after age 4 should be evaluated by a pediatric orthopedist.
- Usually normal when: Knock knees are symmetric and mild.
- Call your doctor if: Sudden worsening of knock knees.
- Varies by age — see the age-by-age breakdown below
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What Parents Should Know
According to AAP, NIH, CDC guidelines, mild knock knees are a normal developmental phase that peaks around age 3-4 and typically resolves by age 7-8. However, severe knock knees (where the distance between ankles is greater than 8-10cm when knees touch), asymmetric knock knees, or knock knees that worsen after age 4 should be evaluated by a pediatric orthopedist. At 12-24 months, as bowed legs straighten, they often overcorrect into mild knock knees. This is a normal progression. Mild knock knees at this age are not concerning. It is generally considered normal when knock knees are symmetric and mild. However, you should contact your pediatrician promptly if sudden worsening of knock knees.
Normal vs. Concerning
By Age
What to expect by age
12-24 months
As bowed legs straighten, they often overcorrect into mild knock knees. This is a normal progression. Mild knock knees at this age are not concerning.
2-4 years
Knock knees typically peak at age 3-4. Some degree of knocking is completely normal. If the distance between ankles when knees are touching is very large, or if it is much worse on one side, mention it to your pediatrician.
4-6 years
Knock knees should be improving by age 4-5. If they are worsening, severe, or causing your child difficulty with walking or running, evaluation is recommended.
6-8 years
Most physiological knock knees resolve by age 7-8. If significant knock knees persist, a pediatric orthopedist can evaluate for underlying causes and discuss treatment options if needed.
What to Tell Your Pediatrician
- Describe when you first noticed my toddler has severe knock knees and how it has changed over time.
- Note your baby's current age and which age-specific patterns you are seeing.
- Mention if knock knees are severe (large gap between ankles when knees touch).
- Mention if knock knees are much worse on one side.
- Let your doctor know if you have noticed any related concerns, such as changes in feeding, sleep, or movement patterns.
- Bring a list of any questions or observations you want to discuss at the appointment.
What Should You Do?
When to take action
- Knock knees are symmetric and mild.
- Your child is between 2-5 years old.
- Knock knees are improving over time.
- Your child runs and plays without difficulty.
- Knock knees are severe (large gap between ankles when knees touch).
- Knock knees are much worse on one side.
- Knock knees are getting worse after age 4.
- Sudden worsening of knock knees.
- Pain or difficulty walking due to knee alignment.
What You Can Do at Home
- Keep track of when you notice my toddler has severe knock knees — noting the time of day, duration, and any triggers can help your pediatrician.
- Remember that knock knees are symmetric and mild — this is generally within the range of normal.
- At 12-24 months, focus on observation rather than intervention unless your pediatrician advises otherwise.
- Provide plenty of supervised floor time and tummy time to support your baby's physical development.
- While monitoring at home, seek immediate care if sudden worsening of knock knees.
Related Conditions
My Toddler Has Knock Knees
Knock knees (when the knees touch but the ankles don't when standing) are completely normal in toddlers and young children, especially between ages 2-5. This is actually a natural stage of leg development that most kids go through after their baby bowlegs straighten out. In the vast majority of cases, knock knees resolve on their own by age 6-7.
My Baby's Bowed Legs Are Not Straightening
Physiological bowing (normal bowed legs) should begin straightening after age 18-24 months. If bowing persists beyond age 2, worsens, or is asymmetric (more on one side), it may indicate Blount disease, rickets, or other conditions that benefit from treatment. Most persistent bowing is treatable when caught early.
Related Resources
Milestone Checklists by Age
Track your baby's developmental milestones from birth to 5 years with age-specific checklists.
Month-by-Month Development
Detailed monthly development guides from birth through 24 months.
When to Call the Doctor
General guide on when to call the pediatrician, visit urgent care, or go to the ER.
Frequently asked questions
Is my toddler has severe knock knees normal?
When should I call the doctor about my toddler has severe knock knees?
When is my toddler has severe knock knees normal?
What causes my toddler has severe knock knees?
What should I mention to my pediatrician about my toddler has severe knock knees?
Is my toddler has severe knock knees normal at 12-24 months?
Is my toddler has severe knock knees normal at 2-4 years?
Should I go to the ER for my toddler has severe knock knees?
Does my toddler has severe knock knees go away on its own?
References
Doctor Visit Checklist
Bring this checklist to your next pediatrician visit to discuss My Toddler Has Severe Knock Knees.
Things to mention
- Describe when you first noticed my toddler has severe knock knees and how it has changed over time.
- Note your baby's current age and which age-specific patterns you are seeing.
- Mention if knock knees are severe (large gap between ankles when knees touch).
- Mention if knock knees are much worse on one side.
- Let your doctor know if you have noticed any related concerns, such as changes in feeding, sleep, or movement patterns.
- Bring a list of any questions or observations you want to discuss at the appointment.
Observations to share
- Knock knees are severe (large gap between ankles when knees touch).
- Knock knees are much worse on one side.
- Knock knees are getting worse after age 4.
Urgent signs to report immediately
- Sudden worsening of knock knees.
- Pain or difficulty walking due to knee alignment.
My notes
From ismybabyalright.com — free, evidence-based baby health guides
All content follows our editorial policy and is reviewed against published clinical guidelines.
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Related Resources
Bottom line
Most cases of my toddler has severe knock knees are normal. Talk to your pediatrician if sudden worsening of knock knees.
Trust your instincts. If something feels wrong, reach out to your pediatrician. Worrying about your baby means you care — that is a good thing.
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Related Physical Concerns
My Toddler Has Knock Knees
Knock knees (when the knees touch but the ankles don't when standing) are completely normal in toddlers and young children, especially between ages 2-5. This is actually a natural stage of leg development that most kids go through after their baby bowlegs straighten out. In the vast majority of cases, knock knees resolve on their own by age 6-7.
My Baby's Bowed Legs Are Not Straightening
Physiological bowing (normal bowed legs) should begin straightening after age 18-24 months. If bowing persists beyond age 2, worsens, or is asymmetric (more on one side), it may indicate Blount disease, rickets, or other conditions that benefit from treatment. Most persistent bowing is treatable when caught early.
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