Sensory Processing in Toddlers: Signs, Systems, and What Helps

Your toddler dissolves at the tag in their shirt. Refuses anything mashed. Crashes into furniture with reckless enthusiasm. Puts their hands over their ears in the supermarket. These responses can seem baffling when siblings or playgroup peers seem unbothered by the same things. But for some children, the nervous system is genuinely doing something different — not being difficult, not undisciplined. The input is simply landing differently.

Sensory processing differences affect how the brain registers, interprets, and responds to sensory information. Understanding the basics helps you distinguish typical toddler sensory preferences from patterns worth investigating, and gives you practical strategies to help.

The Eight Sensory Systems

Most people are taught five senses in school. But the nervous system processes eight distinct types of sensory information, and the less-familiar three are especially relevant to toddler behaviour:

Source: Sensory Integration Network; Kranowitz (2005) The Out-of-Sync Child

Children with sensory processing differences may have atypical responses in one system, several, or — less commonly — all of them. A child who is hypersensitive in the auditory system may be hyposensitive (seeking) in the proprioceptive system. Mixed profiles are the norm, not the exception.

Two Directions of Difference

Sensory responses fall along a continuum. It's useful to think in two directions:

Over-responsive (hypersensitivity): The nervous system amplifies sensory input beyond typical intensity. A shirt tag feels like sandpaper. A moderate sound feels painfully loud. Unexpected light touch feels threatening.

Under-responsive (hyposensitivity) / sensation-seeking: The nervous system requires more input to register a sensation, or seeks intense input to achieve a satisfied, regulated state. The child appears not to feel pain, crashes and bumps, chews on non-food items, or seeks spinning and rough-house play intensely.

Many children display both in different systems — which can make the overall picture confusing.

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When Is It a Problem Worth Addressing?

Toddler sensory preferences are almost universal. The question is whether they disrupt functioning:

• Is your child excluded from mealtimes because their safe food list is 3–5 items?
• Do normal daily activities — haircuts, bathing, dressing — consistently produce extreme distress beyond brief protest?
• Is your child unable to participate in typical toddler activities (playground, playgroup, mealtimes) due to sensory responses?
• Are their sleep, eating, or social engagement significantly affected?

If the answer to these is yes, an occupational therapy assessment is warranted. If the answer is "my child is picky and loud," routine developmental variation is more likely.

What Occupational Therapy Does

An OT trained in sensory integration (Ayres Sensory Integration / ASI) will:

1. Assess sensory processing profile using standardised tools (e.g., Sensory Profile by Dunn, Sensory Processing Measure)
2. Identify the child's sensory patterns across all systems
3. Provide direct therapy using structured sensory play activities: swings, pressure activities, textured materials, proprioceptive "heavy work"
4. Create a personalised sensory diet — a tailored daily schedule of sensory activities for the home environment
5. Coach parents on environmental modifications and how to respond to sensory reactions in ways that build regulation rather than reinforce avoidance

The evidence base for Ayres Sensory Integration therapy is improving. A 2018 Cochrane review found that while more high-quality RCTs are needed, there is growing evidence for ASI improving participation in daily activities in autistic children with sensory differences.

Home Strategies for Common Sensory Challenges

You do not need to wait for an OT appointment to begin supporting sensory regulation. General principles:

For hypersensitive children: predictability, preparation, and gradual exposure

• Warn before touch, especially unexpected touch
• Use firm pressure (deep pressure) rather than light touch — it is less aversive
• Introduce challenging textures/surfaces incrementally, without force
• Create predictable sensory environments; reduce noise/visual clutter at home

For sensation-seekers: meet the need safely

• Build in daily "heavy work" — carrying groceries, pushing a weighted trolley, climbing, rough-and-tumble play
• Set up a sensory corner with crash cushions, beanbags, and resistive play materials
• Channel crashing and intense movement into safe physical play structures

Feeding and Sensory: A Special Mention

Feeding difficulties in toddlers are one of the most common presentations of oral sensory differences. If your toddler's acceptable food list has become extremely narrow, why toddlers stop eating explains when that's sensory versus developmental appetite change. If your child's acceptable food list is extremely narrow (often under 20 foods), if they gag at textures they haven't even touched, or if meals consistently end in distress — an SLT-OT team with feeding therapy training (or a dedicated feeding therapist) is worth pursuing. Oral motor and sensory feeding difficulties are well within the scope of early intervention.

When to Call Your Doctor

• Your toddler is losing previously tolerated foods or sensory tolerance (regression)
• Sensory responses are consistently interfering with eating, sleep, or social participation
• You notice sensory differences alongside social communication concerns (not pointing, not responding to name, limited eye contact)
• Sensory responses are becoming more intense or broader over time, not lessening
• You're worried enough to be researching at 11pm — trust that instinct and make an appointment