At what age can sensory integration therapy start?

Formal assessment usually begins around age three or four, because before that it is hard to separate ordinary developmental variation from lasting difficulty. That does not mean nothing can be done sooner — with a two-year-old the work happens through changes to daily routines and movement play at home, not through clinic sessions.

Is sensory processing disorder an official medical diagnosis?

No. Neither ICD-11 nor DSM-5 lists it as a distinct condition. The American Academy of Pediatrics advises against using it as a stand-alone diagnosis and recommends checking whether the difficulties stem from autism, ADHD, anxiety or motor disorders instead. A child's sensory profile is real and worth describing — but as part of the picture, not as a label that replaces it.

How long does SI therapy take before results show?

A typical course is one or two sessions a week over several months. In the randomised trial by Schaaf and colleagues (2014), measurable changes in everyday functioning appeared after roughly 30 sessions. Parents usually notice small things first: fewer battles over hair-washing, longer sitting at the table, a calmer return from nursery.

Does SI therapy replace speech or physical therapy?

No. SI works on how a child receives and organises sensory input, not on articulation or body structure. A child with delayed speech needs a speech and language therapist; a child with marked postural asymmetry needs a physiotherapist — sometimes alongside SI, sometimes instead of it.

Will my child grow out of sensory sensitivity?

Some difficulties do ease as the nervous system matures and the child develops coping strategies. But "they'll grow out of it" is not a plan. If labels, hair-washing or canteen noise cost your child tears every single day, it is worth acting now — not to rush nature, but so that these years are not one long series of defeats.

Labels bite, the blender paralyses, hair-brushing is a battle. What sensory integration really is — and when therapy helps

Sensory integration is how the brain organises signals from the body and the world around it. When that process falters, a child is not being difficult — they are overloaded. SI therapy is targeted movement play that teaches the nervous system to sort those signals. Here is who it genuinely helps, and what it does not promise.

In brief — the key points

There are more than five senses. Alongside sight, hearing, taste, smell and touch, three systems do quiet work: the vestibular system (balance), proprioception (deep pressure sense from muscles and joints) and interoception (signals from inside the body).
The signs fall into two groups. Over-responsivity means avoiding input — labels, noise, hair-washing. Under-responsivity means hunting for it — constant motion, crushing hugs, a high pain threshold. One child can show both, in different senses.
Therapy looks like an excellent playground — suspended swings, scooter boards, tunnels, ball pits. For the child it is play. For the therapist every activity has a planned purpose.
The evidence is promising but not conclusive. Randomised trials show improvement in everyday functioning, yet the American Academy of Pediatrics warns against treating “sensory processing disorder” as a stand-alone diagnosis. I write this plainly, because over-promising harms children more than it helps them.

Eight senses, not five

School taught us about five senses and there the matter usually rests. In fact, most of what a child’s brain learns about the world arrives through systems we never gave everyday names to.

The vestibular system sits in the inner ear and governs balance and the body’s orientation in space. It tells the brain whether you are upright, tilted, moving, and how fast. A child whose vestibular system is under-stimulated will spin in circles to exhaustion — not out of naughtiness, but because only that dose of movement tells them where they are.

Proprioception gathers information from muscles, tendons and joints. It is why, with your eyes closed, you know where your hand is. When it works poorly, a child cannot feel the boundaries of their own body precisely — so they seek a strong signal: crashing into walls, squeezing too hard, sitting on other children, chewing their collar.

Interoception is the most recently described of the three: signals from inside the body. Hunger, fullness, a full bladder, a racing heart, the tight stomach before nursery. A child with weak interoception may genuinely not know they are hungry or need the toilet — until it becomes a crisis.

The brain as conductor

The best metaphor I know for sensory integration is an orchestra.

Each sense is an instrument. Alone, each plays correctly. But for music to happen, someone has to decide what comes forward and what recedes. Sitting in a café having a conversation, your brain right now is suppressing the hiss of the coffee machine, the feel of clothing on your skin and the smell from the kitchen — while amplifying your companion’s voice. You are not doing this consciously. The conductor works on its own.

In a child with sensory integration difficulties, the conductor is off. Every instrument plays at once and at the same volume. The buzz of a fluorescent light matters as much as the teacher’s instruction. The label at the back of the neck shouts louder than the task in the workbook.

And here is the most important sentence in this article: a child in that state cannot concentrate — not because they will not, but because there is nothing left to concentrate with. Their entire attention is spent surviving the chaos.

Which signs are worth noticing

The signals fall into two opposing groups — and that is what confuses parents most, because one child can show both, in different senses.

Over-responsivity, or sensory defensiveness

The nervous system reads ordinary input as a threat and mounts a defence:

covering ears at the vacuum cleaner, blender, hairdryer, or in a swimming pool hall;
panic over labels, sock seams, stiff trousers, tight waistbands;
hair-washing, nail-cutting and brushing as a daily battle;
refusing to touch sand, play dough, glue, wet food;
food selectivity driven by texture rather than taste;
avoiding crowds, funfairs, soft-play centres.

Under-responsivity, or sensory seeking

Here it is the opposite — input must be intense to register at all:

constant spinning, rocking on the chair, jumping, running in circles;
deliberately crashing into walls, furniture, other people;
hugging with a force the other person finds uncomfortable;
a high pain threshold — the child does not report falls, bruises or cuts;
mouthing objects long past the age where that is typical.

Motor difficulties

A third group concerns how a child manages their body: frequent tripping and bumping, “clumsiness”, trouble catching a ball, late bike-riding, tiring quickly when drawing, avoiding games that demand coordination.

An important caveat. A single item from these lists means nothing. Almost every child goes through a phase of hating labels or fidgeting at the table. What matters is intensity, frequency and cost: whether it genuinely disrupts daily life — dressing, eating, being in a group, falling asleep — and whether it has lasted months rather than the week after a house move.

What sessions actually look like

This is probably the biggest misconception about SI. Parents often picture a clinic, a treatment couch and exercises “to be performed”. The reality is nothing like it.

For the child it is simply an excellent playground. An SI room holds suspended platforms and swings, scooter boards, hammocks, tunnels, ball pits, bolsters, large therapy balls, textured pathways, climbing walls. Children usually do not want to leave. Nobody tells them they are being treated.

For the therapist every activity has a purpose. When a child swings on a platform while collecting blocks scattered around, several things happen at once: the vestibular system is stimulated, postural muscles hold the body in position, the eyes track a moving target, and the hand plans a grasp. This is not swinging for fun — it is a precisely calibrated task whose difficulty rises step by step.

The child leads, the therapist steers. In the classical Ayres approach the therapist does not force exercises. They watch what the child reaches for and modify the environment so that the child’s own choice serves the therapeutic goal. Hence the description I like best: this is therapy that looks like play, because play is the native language of development.

What therapy delivers — and what it does not promise

Here I have to write something you will not find in most material promoting SI. I decided you are owed it, and so is your child.

What parents report and research supports

In a 2014 randomised trial by Roseann Schaaf and colleagues, children with autism who received ten weeks of sensory integration–based therapy scored significantly better than the control group on individually set functional goals, and on the amount of caregiver help needed for self-care and socialisation. That result matters because what was measured was not an abstract scale but real life: whether the child dresses themselves, whether their hair can be washed, whether they can eat a meal with the family.

A 2019 systematic review by Sarah Schoen and colleagues, covering Ayres-model intervention studies, found moderate-quality evidence for improvement on individualised goals — while noting that samples were small and the methodology in some studies imperfect.

In practice, parents most often tell me three things:

Better concentration. A regulated child can sit longer and see a task through.
Calmer emotions. Fewer sudden meltdowns driven by overload — the kind that arrive from nowhere and cannot be talked down.
More confidence. A child with better command of their own body joins peers more readily and tries new things.

What the evidence does not confirm

In 2012 the American Academy of Pediatrics issued a statement that remains the reference point. It says two things.

First: paediatricians should not diagnose “sensory processing disorder” as a stand-alone condition. Sensory difficulties are very often a symptom of something else — autism, ADHD, anxiety, motor disorders. Stopping at the “SI” label risks missing what actually needs attention.

Second: sensory-based therapy may be acceptable as one component of a comprehensive plan, but parents should be told that the evidence for its effectiveness is limited and inconclusive.

I do not read that statement as a verdict against SI therapy — I read it as marking out its proper place. Sensory integration therapy makes sense as part of a child’s support, after a careful differential assessment, with specific measurable goals and a date on which you check whether anything changed. It does not make sense as an open-ended subscription with no review point, or as the answer to every difficulty.

If a therapist promises that SI will “cure” autism, ADHD or dyslexia — that is the moment to find a different therapist.

Therapy is not the whole job — home does half of it

An hour a week in a clinic will not reshape a nervous system that spends the other one hundred and sixty-seven hours as before. Good therapy always extends beyond the room.

The key concept is called a sensory diet — a term coined in the 1980s by the American occupational therapist Patricia Wilbarger. It has nothing to do with food. It means deliberately supplying a child, at regular points through the day, with the movement and touch input their nervous system actually needs — the way you plan meals rather than waiting until someone faints from hunger.

In practice this means surprisingly simple things: kneading dough, being rolled tightly in a blanket, an obstacle course built from cushions, carrying shopping bags, hanging from a bar, firm hugs on demand. I have set this out in detail — with a ready-made daily plan and specific games — in a separate article: a sensory diet at home.

It is also worth reading how screens fit into this picture, because they are one of the most common and least obvious factors: sensory issues and screens.

Where to start

If you finished this thinking “that is my child”, I suggest three steps, in this order.

Keep notes for two weeks. When the difficulties appear, at what time, after what, how long they last, what helps. That is the most valuable thing you can bring to a specialist — more valuable than a list of symptoms from the internet.
Start with your paediatrician and the whole picture, not straight with an SI therapist. Rule out what can be ruled out: hearing, vision, anxiety, autism. An SI assessment is worth having when it forms part of the whole.
When choosing a therapist, ask about goals. A good one will tell you what specifically they want to work on, how you will both know it worked, and when you will check together. If all you hear is generalities about “stimulating the nervous system” — keep asking.

Your child is not difficult. Their brain is working in harder conditions than their peers’. That is an enormous difference — not least because the second version is something you can actually do something about.

Sources

Ayres, A. J. (2005). Sensory Integration and the Child: Understanding Hidden Sensory Challenges (25th Anniversary Edition). Western Psychological Services. (originally published 1979)
Zimmer, M., Desch, L., et al.; American Academy of Pediatrics, Section on Complementary and Integrative Medicine, Council on Children with Disabilities (2012). “Sensory Integration Therapies for Children With Developmental and Behavioral Disorders”. Pediatrics, 129(6), 1186–1189. doi.org/10.1542/peds.2012-0876
Schaaf, R. C., Benevides, T., Mailloux, Z., Faller, P., Hunt, J., Van Hooydonk, E., et al. (2014). “An Intervention for Sensory Difficulties in Children with Autism: A Randomized Trial”. Journal of Autism and Developmental Disorders, 44(7), 1493–1506. doi.org/10.1007/s10803-013-1983-8
Schoen, S. A., Lane, S. J., Mailloux, Z., May-Benson, T., Parham, L. D., Smith Roley, S., & Schaaf, R. C. (2019). “A Systematic Review of Ayres Sensory Integration Intervention for Children with Autism”. Autism Research, 12(1), 6–19. doi.org/10.1002/aur.2046
Wilbarger, P., & Wilbarger, J. L. (1991). Sensory Defensiveness in Children Aged 2–12: An Intervention Guide for Parents and Other Caretakers. Avanti Educational Programs.

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 sensory difficulties in children.

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.