Intense interests are part of childhood — lots of kids go through a dinosaur phase or a trucks phase. But in autism, special interests are qualitatively different: they’re often unusually narrow, remarkably deep, and remarkably hard to shift away from. Here’s how to tell the difference between a typical childhood passion and an autism-associated restricted interest.
When an intense interest is a red flag for autism
Restricted and repetitive interests are a core diagnostic criterion for autism in the DSM-5. But diagnosing a “special interest” as autism-associated requires more than just noticing that a child likes something a lot. The features that distinguish autism-related interests from typical childhood passions include: unusual narrowness (not “loves Thomas the Tank Engine” but “can recite every engine’s number and episode appearance”); an unusual topic for the age (deep fascination with industrial fans, sprinkler systems, bus schedules, or the taxonomy of insects is less typical than dinosaur enthusiasm); inability to shift away from the topic in conversation, play, or daily activity without significant distress; and the interest dominating most of the child’s cognitive and conversational life. Our autism signs overview explains how restricted interests fit into the overall diagnostic picture.
The intensity and rigidity are the key markers — not the interest itself. A child who loves trains, talks about trains some of the time, plays with other things too, and can be redirected when needed is different from a child who talks about trains continuously, becomes dysregulated when asked to stop, and cannot engage in play or conversation that doesn’t involve trains. The second pattern reflects the kind of restricted, inflexible engagement that clinicians look for. Pair it with social communication differences — how does your child connect with peers, respond to their name, use eye contact? — and you have a picture worth bringing to a developmental evaluation. Visit our NJ autism evaluation guide to learn more.
What to do if you’re worried — and how ABA can help
If your child’s intense interest feels qualitatively different from the typical enthusiasms of childhood — if it’s crowding out other activities, dominating all conversation, and causing distress when interrupted — it’s worth discussing with your pediatrician in the context of a broader developmental screening. The interest itself is not the problem; what matters is the flexibility and breadth of the child’s overall engagement with the world. Document specific examples and bring them to your appointment. Explore next steps through our autism evaluation guide for NJ families.
In ABA therapy, special interests are actually a powerful therapeutic tool — not something to be suppressed. Skilled ABA therapists use a child’s intense interests as motivation and leverage to build new skills, expand the child’s repertoire, and create moments of genuine connection. At the same time, ABA addresses the rigidity around interests by building flexibility — helping children tolerate transitions and engage with topics beyond their area of focus. At Autumn ABA, we embrace what makes each child unique. Schedule a free consultation or learn more on our parent resources page.
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Schedule a free consultation Our ABA programs →Frequently asked questions
My child loves dinosaurs A LOT — does that mean autism?
Not by itself, no. Intense dinosaur phases are extremely common in neurotypical children and have been for generations. What would make it more concerning in the autism context is if the dinosaur interest is so specific, so dominant, and so inflexible that it crowds out everything else — and especially if it’s paired with other social communication differences. A child who loves dinosaurs, can talk about other things, plays imaginatively, and connects well with peers is almost certainly in the typical range.
Can special interests actually be a strength in autism?
Absolutely — and this is one of the most important reframes for families. Special interests in autism often come with extraordinary depth of knowledge, exceptional memory, and genuine expertise. Many autistic adults describe their special interests as a source of joy, identity, career direction, and social connection with others who share them. The goal of therapy is not to eliminate special interests but to help the child develop the flexibility to engage with the broader world alongside their passion.
This page is general educational information, not medical advice. Every child is different — a BCBA can assess your child’s specific needs. Autumn ABA serves families in all 21 NJ counties; see where we provide ABA therapy.