Two Boys, One Birthday Party
The bouncy castle was barely inflated when six-year-old Ayaan had tried every game in the backyard. He grabbed the bubble wand mid-turn, sprinted to the snack table, then shouted an answer over the magician. He wanted to be in the middle of everything.
Across the yard, four-year-old Leo had found the party-favour cars. He lined them up along the patio step, bumper to bumper, and didn’t look up when the other kids called his name. When everyone started singing “Happy Birthday,” he pressed his hands over his ears.
Their mothers met by the cake. Both had recently heard the same comment from educators: “He has trouble paying attention.” That night, both typed the same question into their phones: Is it ADHD or autism?
The answer, it turned out, was different for each boy.
Ayaan and Leo are illustrative, but many Canadian parents will recognize this scene.
What Are ADHD and Autism?
Both are neurodevelopmental conditions. They begin in early childhood but are separate diagnoses with different criteria.
ADHD (attention-deficit/hyperactivity disorder) affects attention, activity level and impulse control. A 2022 review co-authored by the Canadian ADHD Resource Alliance (CADDRA) cites one five-province study that found ADHD in 8.6% of children and youth.
Autism spectrum disorder (ASD) involves differences in social communication, along with restricted or repetitive patterns of behaviour, interests or sensory experience. According to the Public Health Agency of Canada, 1 in 50 Canadians aged 1 to 17 has an autism diagnosis, and just over half were diagnosed before age five.
How ADHD and Autism Are Similar
Shared traits make the two hard to tell apart at first. A child with either condition may:
- Struggle to stay on task in class
- Have intense emotions and meltdowns
- Find waiting, turn-taking and transitions hard
- Have trouble making or keeping friends
- Find planning and organizing difficult (executive functioning)
The two can also happen together. Since the DSM-5 in 2013, a child can be diagnosed with both. Research now suggests that 50% to 70% of autistic people also have ADHD, a combination some families call “AuDHD.”
Key Differences Between ADHD and Autism
The same behaviour can have very different reasons. That why is what a good assessment looks for.
Attention
Ayaan’s attention jumps to whatever is newest. Leo’s locks onto what interests him, and shifting it feels hard. Children with ADHD can hyperfocus on favourites too, so patterns matter more than single moments.
Social Connection
Ayaan wanted into every game, but impulsivity made waiting his turn almost impossible. Leo was content playing alone. Many autistic children process social cues, eye contact and back-and-forth conversation differently.
Routines and Repetition
Ayaan, like many children with ADHD, is always moving and bored by routine. Leo, like many autistic children, finds comfort in sameness; lining up cars calms him, and surprise changes can cause real distress.
Sensory Experiences
Sensitivity to sound, light or textures is part of the diagnostic criteria for autism. Leo’s covered ears are a classic example. For ADHD, sensory differences are not a core criterion.
ADHD vs. Autism in Children at a Glance
Use this to start a conversation with your doctor, not as a diagnostic checklist.
| Area | ADHD | Autism |
|---|---|---|
| Attention | Drifts to new, exciting things; may hyperfocus on favourites | Deep focus on specific interests; hard to shift |
| Social | Wants to connect; impulsivity disrupts turn-taking | Processes social cues and conversation differently |
| Routine | Bored by sameness; seeks novelty | Comfort in predictability; change can cause distress |
| Sensory | May seek movement; not a core criterion | Sensory sensitivities are part of the criteria |
| Language | Usually on track; may talk a lot or interrupt | May include delays, echoed phrases or literal understanding |
| Movement | Fidgeting and restlessness | Repetitive movements or play, like lining up toys |
Why the Right Answer Leads to the Right Support
A clear diagnosis shapes which therapies, school supports and funding you can access. In Ontario, for example, an autism diagnosis opens the door to the Ontario Autism Program (OAP).
For autistic children, Applied Behaviour Analysis (ABA) is one of the most widely recommended evidence-based approaches. A Board Certified Behavior Analyst (BCBA) breaks skills into small steps and tracks progress with data. Visual schedules and positive reinforcement can also help autistic children who have ADHD.
Where therapy happens matters too:
- ABA therapy at home Canada: one-on-one sessions in your child’s most familiar setting, with parents learning alongside.
- ABA therapy at daycare: support during real peer play and transitions, where children like Leo need it.
- ABA therapy in Toronto: in-home, daycare and virtual options for families across the GTA.
For ADHD alone, care is usually doctor-led and may include parent training, school supports and sometimes medication.
When to Ask for an Assessment
Talk to your family doctor or paediatrician if you notice:
- The same challenges at home and at school or daycare
- Any loss of words or social skills your child once had
- Attention or behaviour difficulties lasting six months or more
- Strong reactions to sounds, textures or changes in routine
Your doctor can refer you to a developmental paediatrician or psychologist. While you wait for a diagnosis, a BCBA-led children’s assessment can map your child’s needs so you can start strategies sooner.
As for Ayaan and Leo? Ayaan was diagnosed with ADHD; his school added movement breaks. Leo was diagnosed with autism. With ABA support at daycare, he now joins circle time wearing noise-reducing earmuffs and following a picture schedule. Same question, two answers, and two boys who finally got support that fits.
Not sure where your child fits? Book a free consultation, and we’ll help you plan the next step.
Frequently Asked Questions
Can a child have both ADHD and autism?
Yes. It’s common: studies estimate that 50% to 70% of autistic people also have ADHD, and clinicians can diagnose both together.
Is ADHD a type of autism?
No. They are separate neurodevelopmental conditions with different diagnostic criteria, although they share some traits and often occur together.
At what age can ADHD and autism be diagnosed?
Signs of autism often appear in the toddler years, and in Canada just over half of diagnosed children were diagnosed before age five. ADHD is usually identified after a child starts school, when attention demands grow.
Does ABA therapy help children with ADHD?
ABA is best known as an evidence-based approach for autism. Its tools, such as clear routines and positive reinforcement, can also support ADHD-related behaviours, especially when a child has both. A BCBA can tell you whether it suits your child.
Who can diagnose ADHD or autism in Canada?
Start with your family doctor or paediatrician. A diagnosis is usually made by a paediatrician, developmental paediatrician, psychologist or psychiatrist.
Can ABA therapy happen at home or at daycare?
Yes. Advance Therapy offers ABA therapy at home, at daycare and online across Canada, with in-home and daycare sessions available in Toronto and the GTA.
