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Signs of autism in toddlers — Ontario parent guide

Early signs of autism in toddlers, plus what to do next: M-CHAT screening, when to see your doctor, public vs private assessment in Ontario.

Direct answer

Common signs in toddlers include limited eye contact, not responding to their name, no babbling by 12 months, no pointing or waving by 14 months, no single words by 16 months, no pretend play by 18 months, no two-word phrases by 24 months, loss of previously-acquired skills, repetitive movements, distress at small changes in routine, unusual sensory responses, and lining up toys rather than playing with them. No single sign confirms autism — it is the combination and persistence over time.

Page checked · Sources

Why Timing Matters

The wait outlasts the window.

Clinical research (American Academy of Pediatrics; Hyman et al., Pediatrics 2020) identifies birth to age six as the peak neuroplasticity window for autism intervention. Ontario's reported minimum wait is 5+ years for families registered in August 2021 (community-reported, Ontario Autism Coalition, July 2026).

Illustration using 5+ years for families registered in August 2021 (community-reported, Ontario Autism Coalition, July 2026)

Example: an illustrative child's journey through the Ontario Autism Program

Registered at age 3. Services begin at age 8, after 5+ years for families registered in August 2021 (community-reported, Ontario Autism Coalition, July 2026), most of it inside the intervention window.

Early-intervention windowPeak neuroplasticity period (AAP)
Example childRegistered at 3, services at 8
5 years waiting
Age 6
Past age 6when services begin in this example
Registeredage 3
Services beginage 8
012345678
Child's age (years)
Example: early-intervention window vs. Ontario child journey
MeasureAge range
Early-intervention window (AAP)Birth to age 6
Example wait using the OAC-reported minimum (registered age 3)Age 3 to age 8 (5 years)
Age when services begin in this examplePast age 6

✓ Intervention before 6

Research shows 2× greater gains in cognitive and adaptive functioning. Some children lose their diagnosis entirely. The brain's plasticity makes early therapy dramatically more effective.

◌ Intervention after 6

Reduced neuroplasticity means slower progress, higher lifetime costs, and poorer outcomes. Every year of delay narrows the range of achievable milestones. Ontario's waitlist guarantees this for most families.

Of the 71,263 children on the unfunded backlog, the majority were registered between ages 2 and 4. At the current pace, most will age past 6 before receiving any core funding , missing the window that the American Academy of Pediatrics and every major autism research body identifies as critical.

SourceAmerican Academy of Pediatrics (Hyman et al., Pediatrics 2020) · Ontario MCCSS OAP data via FOI · Wait: 5+ years for families registered in August 2021 (community-reported, Ontario Autism Coalition, July 2026).

About This Article

Published:

Written by

Founder & Autism Advocate

Parent of autistic child navigating OAP system

Signs by age milestone

Health Sciences North lists these milestones
a smile or happy expression by 6 months, mimicking sounds or facial expressions by 9 months, babbling or cooing by 12 months, a gesture such as pointing or waving by 14 months, single words by 16 months, make-believe play by 18 months, and two-word phrases by 24 months. Ask your doctor about developmental tests if your child is not reaching them.
Other signs can show up at any age
not responding to their name, poor eye contact, losing skills they had, repetitive movements such as hand-flapping or rocking, strong distress at small changes in routine, unusual responses to sound, touch or other sensory input, and lining up toys rather than playing with them.

M-CHAT screening and clinical pathway

  1. The American Academy of Pediatrics recommends autism screening at 18 and 24 months. A common screening tool is the M-CHAT-R/F (Modified Checklist for Autism in Toddlers, Revised, with Follow-up). The M-CHAT-R/F is a 20-question parent questionnaire with a follow-up interview. A score of 8 or more calls for a referral for a diagnostic evaluation.
  2. The Rourke Baby Record used by Ontario family doctors incorporates ASD surveillance. If concerns arise, speak with your family doctor or paediatrician right away.

Public vs private assessment in Ontario

Public diagnostic hubs
Ontario's public diagnostic hubs take referrals from doctors and nurse practitioners. Holland Bloorview says its initial assessments are covered by OHIP. Wait times vary, so ask for the current wait when you are referred.
Private psychologists or developmental paediatricians
Private psychologists charge a fee that OHIP does not cover. Ask each clinic for its current wait and fee.
Both pathways
Ontario asks for a written diagnosis of autism from a qualified professional for OAP registration.

What if I am wrong and my child is not autistic?

Speech delay, hearing problems, ADHD, and language disorders can all look similar at age 2.

A diagnostic assessment is what differentiates them — not a checklist alone. If signs persist or you continue to feel something is different, push for assessment. Trust your observations as the parent.

Frequently asked questions

Limited eye contact during interaction, not responding to their name, no babbling by 12 months, no pointing or waving by 14 months, no single words by 16 months, no pretend play by 18 months, no two-word phrases by 24 months, loss of previously-acquired skills, repetitive movements, distress at small routine changes, unusual sensory responses, and lining up toys rather than playing with them. No single sign confirms autism — it is the combination and persistence over time.

Research suggests girls are often diagnosed later than boys (Lockwood Estrin et al., 2021). The signs clinicians look for are the same for girls and boys. See our page on signs of autism in toddler girls.

The American Academy of Pediatrics recommends autism screening at 18 and 24 months. A common screening tool is the M-CHAT-R/F (Modified Checklist for Autism in Toddlers, Revised, with Follow-up). It is a 20-question parent questionnaire. A score of 8 or more calls for a referral for a diagnostic evaluation. The Rourke Baby Record used by Ontario family doctors incorporates ASD surveillance.

Speak with your family doctor or paediatrician and ask for the M-CHAT-R/F and a referral. You can ask for a public assessment (OHIP-covered) and also contact private clinics for their current wait and fee.

Ontario asks for a written diagnosis of autism from a qualified professional for OAP registration; either pathway can provide one. Public diagnostic hubs take referrals from doctors and nurse practitioners, and a private psychologist charges a fee that OHIP does not cover. Families report waits of 5+ years for families registered in August 2021 (community-reported, Ontario Autism Coalition, July 2026); 71,263 children have no active Core Funding Agreement (MCCSS FOI via OAC · May 2026).

Many concerns turn out to be developmental variation. Speech delay, hearing problems, ADHD, and language disorders can all look similar at age 2. A diagnostic assessment differentiates them — not a checklist alone. If signs persist or you continue to feel something is different, push for assessment.

Sources

  1. American Academy of Pediatrics

    Hyman et al. (2020), Identification, Evaluation, and Management of Children With Autism Spectrum Disorder. Autism screening at 18 and 24 months.

    Checked

  2. Health Sciences North

    Autism Diagnostic Hub, NEO Kids and Family Program

    Checked

  3. Rourke Baby Record

    Ontario family doctor developmental surveillance

  4. Ontario Autism Program (ontario.ca)

    Eligibility: a written diagnosis of autism from a qualified professional, with a statement that the child meets the diagnostic criteria for autism spectrum disorder.

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Next step near you

Where to be assessed near you

See every Ontario city we track

Assessment routes, local providers and school boards are tracked city by city. Pick the one closest to you.

Where the wait clock starts

See how registration worksEmail your MPP

A child's place in the Ontario Autism Program queue is set by the AccessOAP registration date. 71,263 children are registered and still waiting for core funding (MCCSS FOI via OAC · May 2026).

Talk to your doctor today, not in three weeks.

Research suggests early intervention during the commonly described 0-6 window is associated with the strongest developmental outcomes. The OAP waitlist clock starts at registration.

Signs of autism in toddler girlsLearn about the M-CHAT screening

Related questions

Evidence for this answer

Watchdog Reports

  • [2024]
    Ministry of Children, Community and Social Services: Spending Plan Review
    Financial Accountability Office of Ontario (FAO) • Watchdog report • 2024-06-05
    View

FOI Records

  • [2026]
    Ontario Autism Program figures as of May 13, 2026 (MCCSS, released under Freedom of Information to the Ontario Autism Coalition; published in the OAC "OAP At A Glance" update, July 2026)
    Ministry of Children, Community and Social Services (Ontario), obtained by the Ontario Autism Coalition • FOI record • 2026-05-13
    View

Commitment to Accuracy: Our data is verified against official government reports (FAO, MCCSS), peer-reviewed scientific literature, and accessible public records. Last updated: April 29, 2026.

Citable facts from this page(1)

What does the WHO say about early autism intervention timing?

The WHO Fact Sheet on Autism Spectrum Disorders (updated Sept. 17, 2025) states that timely access to early evidence-based psychosocial interventions can improve the ability of autistic children to communicate effectively and interact socially. Dawson et al. (2010, Pediatrics; PMID 19948568) confirmed in an RCT that ESDM (Early Start Denver Model) at 18–30 months produced significant developmental gains.

Source: WHO Fact Sheet: Autism Spectrum Disorders (updated Sept. 17, 2025); Dawson et al., Pediatrics 2010 (PMID 19948568) · Open source record

About this page

Check the author’s context, review method, and how to report an error.

Written by

Founder & Autism Advocate

Lived experience: Parent of autistic child navigating OAP system

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