Does W-sitting need to be corrected?

A 2024 systematic review by Nordon and colleagues found no evidence that W-sitting harms the hips or development — despite half the internet claiming otherwise. That does not make it meaningless: if a child sits that way almost exclusively because they cannot hold their trunk in other positions, postural strength is worth looking at. The signal is the exclusivity, not the position itself.

Does my child need to do exercises every day at home?

Usually it is not about a daily exercise set but about changing the conditions: more free movement, less sitting, a better-sized chair, space to climb. The WHO recommends at least 180 minutes of varied activity daily for three- and four-year-olds — a more useful benchmark than ten minutes of corrective exercises.

Should I worry about flat feet in a four-year-old?

In young children the arch of the foot is still forming and so-called flat foot is typical at this age — most children grow out of it on their own. A consultation is warranted when the foot is rigid or painful, when the child tires markedly faster than peers, or when the picture is clearly asymmetric.

How does physiotherapy differ from sensory integration therapy?

Physiotherapy works on how the body is built and how it moves: strength, range, movement patterns, posture. SI therapy works on how the brain receives and organises sensory input. The two overlap — a clumsy child may have a motor difficulty, a sensory one, or both — which is why good assessment starts with the question of cause, not with a choice of method.

Paediatric physiotherapy without the scare stories. Which signs matter and what really happens in a session

Q: At what age should a child first see a physiotherapist?

There is no single age. In infancy a consultation makes sense with marked head-position asymmetry or delayed milestones. In a preschooler — when you see persistent asymmetry, rapid fatigue from movement, or clear difficulty with skills peers have mastered. Beyond that: whenever something worries you and you would rather not sit with it alone.

Paediatric physiotherapy is work on how a child uses their body — strength, balance, movement patterns — delivered through play rather than through a set of exercises. It makes sense when you see persistent asymmetry, rapid fatigue from movement, or clear difficulty with skills that peers already have.

In brief — the key points

Not every “irregularity” is a problem. Flat feet in a four-year-old and temporary knock knees are stages of development, not defects to be fixed.
W-sitting has been heavily oversold by the internet as a danger. A 2024 systematic review found no evidence of harm. What matters is whether the child can also sit any other way.
The signal is persistence and asymmetry, not a single observation: the same leg always taking the weight, the same shoulder held forward, tripping more than peers, quickly giving up on movement.
The clinic looks like a playroom. Exercises are woven into obstacle courses and stories; the therapist invites the body into new patterns rather than forcing positions.
The biggest gains come from changing conditions at home — more free movement, less sitting, a better-arranged room — not from ten minutes of corrective exercises a day.

A child’s body is under constant reconstruction

A small body grows at a rate adults find hard to picture. Every developmental leap — first sitting, first steps, first bike — is a genuine revolution for the musculoskeletal system: proportions change, so does the centre of gravity, muscle tone, and the way joints are loaded.

That is why so many things that look alarming at first glance are simply a stage. A two-year-old’s foot looks flat because a fat pad masks the developing arch. A three-year-old’s knees are often knock-kneed. A four-year-old’s gait is not yet smooth, because coordination is still maturing.

Children instinctively seek the movement they need — climbing, hanging, rolling, running in circles. This is not random. It is the nervous system ordering precisely the input required for the next step.

Sometimes, though, that mechanism stalls. And then it is worth offering a child a hand — not because something is broken, but because development needs a signpost.

Which signs are worth noticing

I do not want to write a list that leaves every parent seeing five postural defects in their child. Let me put it differently: these are the moments when a conversation with someone is worth having.

Favourite but not necessarily optimal positions

During floor play the child picks almost exclusively one position — most often sitting between the heels, the famous W-sit — or noticeably props themselves on one side.

Here I have to stop, because more myths have grown up around W-sitting than around any other topic in paediatric physiotherapy.

A systematic review by David Nordon and colleagues, published in 2024 in Acta Ortopédica Brasileira, analysed the available studies and found no evidence that W-sitting harms the hips or disturbs development. The authors point out that correcting the position is a near-universal practice unsupported by evidence. They add something rarely mentioned: children sit this way because of the transient shape of the femur, which changes with age — and they grow out of the position regardless of whether anyone corrected it.

What follows practically? You do not need to make W-sitting a domestic war. But something else is worth noticing: whether your child can sit any other way too. If they collapse quickly in every other position because they cannot hold their trunk, then the signal is that exclusivity — not the position. In that case you work on postural strength, not on a ban.

Small asymmetries in everyday life

The child consistently prefers to load one leg. One shoulder sits slightly forward. The head tilts more often to one side. Shoes wear down noticeably unevenly.

The key word is consistently. A one-off observation means nothing — children adopt dozens of odd positions a day. A repeating pattern, visible over weeks, is a different matter.

Difficulty with new skills

Learning to ride a balance bike or scooter goes markedly harder than for peers. Catching a ball stays difficult for far longer. The child gives up quickly and starts avoiding physical play — and that is the most concerning sign of all, because it starts a loop: less movement means a weaker body, and a weaker body means even less movement.

Tiring quickly

The child asks to be carried after a few hundred metres, spreads across the table at mealtimes, props their head up while drawing. We often read this as laziness or poor motivation. Sometimes it is simply insufficient postural endurance.

What a session with a physiotherapist looks like

Parents usually expect a white clinic, a treatment couch and a series of instructions. Good paediatric physiotherapy looks nothing like that.

It is a play space. Mats, balls, ladders, balance beams, tunnels, climbing equipment. Exercises are woven into obstacle courses and stories — the child is not “performing a set” but crossing a bridge over a crocodile-filled river, and training balance and trunk stability along the way.

The therapist invites rather than forces. They do not physically place a child in the “correct” position. They modify the task and the environment so that the child reaches for a better movement pattern themselves — because it is easier, more interesting, more effective. A pattern arrived at independently sticks; a forced one disappears the moment the therapist does.

The first session is mostly observation. How the child enters the room, sits down, gets up from the floor, runs, reaches for a toy on a shelf. A physiotherapist reads movement the way a speech therapist listens to speech.

Parents get homework — but rarely a set of exercises. More often: change the chair height, drop the baby walker, carry differently, more floor time, less time in the car seat.

What your child gains

Gentle correction rather than entrenchment. Small irregularities of structure and movement pattern are easier to modify while the body is growing fast. That is an argument for an earlier consultation — not out of fear, but out of convenience.

Better coordination and stability. Everything that comes later rests on these: sport, handwriting, cycling, PE lessons without humiliation.

Confidence. This is the benefit least often mentioned and probably the most important. A child who trusts their own body climbs the frame more boldly, joins the game of tag more readily, and less often chooses to stand at the side. Physical competence is currency in a peer group — especially between four and ten.

What you can change at home

This is the part that genuinely makes the difference — because a child spends an hour a week in a clinic and the rest of their life at home.

Deliberate lifting and carrying. Lift your child through their side rather than pulling both arms upward. Carry them alternately on both hips, not always the same one. When changing a nappy, roll them through their side rather than pulling on the legs.

More floor, less equipment. Bouncers, car seats, walkers and floor seats hold the body in positions a child would not reach on their own, and take away opportunities for their own muscles to work. A floor with a blanket and a few objects within reach is a better developmental environment than most devices sold as developmental.

A sensibly arranged room. Table and chair sized so the feet rest flat on the floor and the knees and hips sit at roughly right angles. Toys at varying heights so the child has to squat and reach up. Something to climb and hang from, even a doorway bar.

Lots of movement, not exercises. The World Health Organization recommends that three- and four-year-olds get at least 180 minutes of varied physical activity a day, spread throughout the day. That is the number worth watching — not ten minutes of corrective exercise.

A few home obstacle courses. Cross the cushions, crawl under the table, walk a masking-tape line, jump over a string, climb onto the sofa and back down backwards. Fifteen minutes a day, without calling it exercise.

When you are not sure

The most common reason parents delay a consultation is: “what if it turns out I am overreacting”.

Let me answer that. A paediatric physiotherapist who tells you “everything is within normal range, please don’t worry” has also done their job. A consultation is not a declaration that something is wrong. It is a way to stop wondering.

And if you notice not just movement difficulties but also strong reactions to touch, sound or texture, it is worth reading how the two areas overlap: what sensory integration is and when therapy helps. Clumsiness can be a motor difficulty, a sensory one, or both — and which one your child has determines what sensible support looks like.

We want one thing for our children: that every step they take — the literal ones and the figurative ones — is steady, sure and safe. Sometimes that takes nothing more than a bit more floor, a bit less car seat, and one conversation with someone who knows how to read movement.

Sources

Nordon, D. G., Passone, C. G. B., Silva, C. A. A., & Grangeiro, P. M. (2024). “W-Sitting in Childhood: A Systematic Review”. Acta Ortopédica Brasileira, 32(6), e279277. doi.org/10.1590/1413-785220243206e279277
World Health Organization (2019). Guidelines on Physical Activity, Sedentary Behaviour and Sleep for Children Under 5 Years of Age. Geneva: WHO. iris.who.int/handle/10665/311664
Zimmer, M., Desch, L., et al.; American Academy of Pediatrics (2012). “Sensory Integration Therapies for Children With Developmental and Behavioral Disorders”. Pediatrics, 129(6), 1186–1189. doi.org/10.1542/peds.2012-0876

About the author

Katarzyna Lis — founder of MOC Montessori Nursery and Preschool in the Białołęka district of Warsaw, where she works day-to-day as a teacher in the preschool group. She holds a degree in elementary education of Montessori Pedagogy, a qualification as a daytime caregiver, and a certificate in Catechesis of the Good Shepherd — a combination that reflects her holistic approach to the development of the child: their body, emotions, relationships, independence and inner world.

In her everyday work with children she does not “run activities” — she accompanies. She creates a space in which the child’s development happens naturally, at their own rhythm, and where the adult is there to look carefully and respond. The same philosophy — observation and response to the child’s signals — underpins her approach to children’s motor development.

Privately, a mother of four, combining the experience of motherhood with a passion for her work. This text was written for Dzieckologia as a practitioner’s voice — from the perspective of a Montessori institution that has, for years, looked at the child as a competent person from the very first months of life.