My Baby Sits in the W Position
The short answer
W-sitting (sitting with knees bent and feet out to the sides forming a W shape) is common in children and is not always a problem. Occasional W-sitting is normal. However, if your child W-sits exclusively and cannot sit in other positions comfortably, it may indicate core weakness or hip tightness that should be addressed.
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By Age
What to expect by age
Some babies naturally transition through a W-sit position as they learn to sit. If your baby can also sit in other positions (cross-legged, legs forward, side sitting), occasional W-sitting is not concerning. Babies with flexible joints may find this position comfortable.
If your toddler W-sits sometimes but easily switches to other positions, this is generally fine. W-sitting provides a wide base of support that some children prefer. Gently encourage other sitting positions by offering activities that require reaching or turning.
If W-sitting is your child's default position and they seem unable or unwilling to sit any other way, mention it to your pediatrician. Exclusive W-sitting can indicate low core strength (the wide base compensates for weak trunk muscles) or tight hip rotators.
Persistent exclusive W-sitting should be evaluated. While research shows it does not cause the orthopedic problems once feared in most children, it can be a sign that your child needs core strengthening. Occupational or physical therapy can help your child develop the trunk strength to sit in varied positions.
What Should You Do?
When to take action
- Your child W-sits occasionally but easily moves into other positions.
- Your child can sit cross-legged, long-sit, and side-sit as well.
- Your child has no pain or difficulty with movement.
- W-sitting is one of several positions your child uses during play.
- Your child exclusively W-sits and refuses or cannot sit in other positions.
- Your child seems to have weak core muscles or poor balance in other sitting positions.
- Your child has a family history of hip problems.
- Your child's legs seem to turn inward when walking.
- Your child has pain in their hips or legs.
- Your child has suddenly started W-sitting after not doing so before, along with other motor changes.
Sources
Related Resources
Trust your instincts. If something feels wrong, reach out to your pediatrician.
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Related Physical Concerns
My Toddler Sits in a W Position
W-sitting - when a child sits with their bottom on the floor and legs splayed out to each side forming a "W" shape - is very common in toddlers and is usually not harmful in moderation. It becomes a concern only if it's the only way your child sits, if they can't sit in other positions, or if it's accompanied by other motor difficulties.
Poor Trunk Control
Trunk control - the ability to hold the torso upright and stable - develops progressively throughout the first year. It is essential for sitting, crawling, standing, and walking. Babies build trunk control through tummy time, supported sitting, and active play. If your baby seems unusually floppy in the trunk or slumps significantly when sitting, your pediatrician can assess whether their core strength is developing as expected.
Low Muscle Tone (Hypotonia)
Low muscle tone means your baby's muscles feel less firm or their body feels "floppy" when you hold them. While it can sometimes indicate an underlying condition, many babies with mildly low tone do very well with support and strengthening activities.
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.