Diagnosing Sensory Differences at 18–24 Months

Sensory differences in toddlers are real and worth understanding — but at 18–24 months we describe and support, rather than rush to a fixed label.

In short

At 18-to-24 months we can certainly notice and describe how your child responds to sights, sounds, textures, movement and touch — but a formal standalone diagnosis of "Sensory Processing Disorder" is not part of the WHO's ICD-11, and most clinicians do not pin a fixed sensory label on a child this young. Instead we observe patterns over time, rule out hearing or other causes, and offer gentle, play-based support straight away. A clinician can map your toddler's sensory profile through careful observation and parent interview, and re-check it as they grow.

What CAN be done at this age

Sensory processing is how the brain takes in and organises information from the body and the world. In toddlers, differences often show up as:

• Strong reactions to sounds, lights, crowds or messy textures (over-responsive)
• Seeking lots of movement, spinning, crashing or deep pressure (under-responsive or sensory-seeking)
• Fussiness with food textures, clothing tags, haircuts or nail-cutting
• Difficulty settling, or seeming "in their own world" amid busy sensory input

At 18–24 months these are observations, not a diagnosis. They are best understood as part of a broader developmental picture — alongside communication, play and motor skills. A first, important step is always to confirm hearing and vision are clear, since these can mimic sensory differences.

When assessment becomes meaningful

There is no need to wait to act, even though we hold off on labels. If sensory responses are disrupting feeding, sleep, dressing or family life, that is reason enough to seek a developmental review now. A clinician (often a paediatric occupational therapist) can build a sensory profile, support daily routines, and monitor how the picture evolves — formal classification, where appropriate, tends to firm up in the preschool years as patterns become consistent.

The Pinnacle way

This is general information, not a diagnosis — individual assessment and diagnosis require an appropriately qualified healthcare professional. Our AbilityScore® is a clinician-administered structured assessment that maps your toddler's sensory and developmental profile against their own baseline, so it can be gently re-measured as they grow. Drawing on 2.5 billion+ data points and 25 million+ therapy sessions across 70+ centres, our therapists turn observations into everyday play-based support. Learn how the measure works at what the AbilityScore is and how it's calculated, explore play-based occupational therapy, or start at our home page.

Trusted sources

The WHO ICD-11 does not list a standalone sensory processing disorder; AAP/HealthyChildren guidance frames early sensory differences within wider development and urges hearing checks first; ASHA notes the value of early observation and support over premature labelling.

Next step — Don't wait on a label to start helping. Book an AbilityScore assessment with a Pinnacle clinician for a clear, re-measurable picture of your toddler's sensory profile.