My Child May Have One Leg Shorter Than the Other
The short answer
Small leg length differences (less than 2cm) are very common and often not noticeable. Larger discrepancies may cause a limp or uneven gait. Your pediatrician can measure leg lengths and determine if a difference is present. Causes range from normal variation to treatable conditions, and many children compensate well.
Parents everywhere have the same worry. You are doing the right thing by looking into it.
By Age
What to expect by age
Leg length differences may be noticed during diaper changes or when your baby's thigh creases seem uneven. Your pediatrician checks for hip dysplasia, which can cause apparent leg length differences. If you notice asymmetry, mention it at your next visit.
As your child starts walking, a leg length discrepancy may become more apparent. A slight limp or uneven gait may be noticed. Your pediatrician can measure leg lengths and determine if imaging is needed.
If a leg length discrepancy is confirmed, your pediatrician will monitor it over time. Small differences often do not need treatment. Larger differences may benefit from a shoe lift or orthopedic evaluation.
Ongoing monitoring ensures the discrepancy is not increasing with growth. A pediatric orthopedist can project whether the difference will increase and recommend appropriate treatment.
What Should You Do?
When to take action
- Very small difference (less than 1cm) which is common.
- Your child walks comfortably with no limp.
- No pain or functional limitation.
- You notice a consistent limp.
- Thigh creases are uneven.
- Your child seems to tilt or lean to one side when standing.
- Sudden onset limping.
- Leg length discrepancy with pain or refusal to walk.
Sources
Related Resources
Trust your instincts. If something feels wrong, reach out to your pediatrician.
Worrying about your baby means you care. That is a good thing.
Related Physical Concerns
My Baby or Toddler Is Limping
A limp in a baby or toddler always deserves medical attention, as young children cannot reliably tell you where it hurts. The most common cause in toddlers is a minor injury such as a 'toddler's fracture' (a subtle shin bone crack) or muscle strain. However, limping can also indicate infection in a joint or bone, hip problems, or other conditions that need prompt evaluation.
Baby Hip Dysplasia (Hip Click)
Developmental dysplasia of the hip (DDH) is a condition where the hip joint does not form properly, ranging from mild looseness to complete dislocation. It occurs in about 1 in 1,000 births and is more common in firstborns, girls, breech babies, and those with a family history. When caught early, treatment with a soft brace (Pavlik harness) is highly effective.
My Toddler Limps After Resting
Limping after rest that improves with movement is a hallmark sign of juvenile idiopathic arthritis (JIA). This "gelling" phenomenon occurs because inflamed joints stiffen during inactivity. If your toddler consistently limps after naps or in the morning but walks better after moving around, contact your pediatrician for evaluation.
My Baby Seems to Use One Side More Than the Other
Babies should use both sides of their body fairly equally during the first 18 months of life. While slight preferences can be normal, a consistent pattern of favoring one side - using one arm much more than the other, crawling with one leg dragging, or turning the head predominantly one way - should always be discussed with your pediatrician. Early identification of asymmetry leads to the best outcomes.
My Baby Only Army Crawls
Army crawling (also called commando crawling) is a completely valid and normal way for babies to move. Many babies army crawl for weeks or even months before transitioning to hands-and-knees crawling, and some skip hands-and-knees crawling entirely. What matters is that your baby is independently mobile and exploring their environment.
One Side of My Baby's Body Moves Differently
Babies should generally use both sides of their body equally. If one side consistently moves differently, is weaker, stiffer, or less coordinated, this warrants evaluation. Asymmetric movement can indicate hemiplegia (cerebral palsy affecting one side), brachial plexus injury, or other neurological conditions that benefit from early therapy.