M-CHAT-R Autism Screening for 18-Month-Olds
18 months is one of the two ages at which the American Academy of Pediatrics (AAP) recommends universal autism screening for all toddlers using the M-CHAT-R. Whether or not you have specific concerns, completing this checklist at the 18-month visit is recommended clinical practice.
- Questions
- 20
- Format
- Yes / No
- Time
- ~5 minutes
- Completed by
- Parent or caregiver
- Age range
- 16–30 months
About the M-CHAT-R
At 18 months, children typically have around 10–20 words, use gestures such as pointing and waving, and engage in simple pretend play — feeding a doll, stirring an empty pot. They should be responding consistently to their name, making eye contact during interaction, and showing objects to caregivers to share interest.
The 18-month visit is often described as the single most important autism screening opportunity in the toddler years. Research shows that autism traits are reliably detectable by this age in many children, and early identification at 18 months leads to earlier access to intervention during the most neuroplastic period of development.
Source: Modified Checklist for Autism in Toddlers, Revised — Robins, Fein & Barton (2009)
Frequently asked questions
- Why is 18 months a recommended screening age?
- The American Academy of Pediatrics recommends universal autism screening at 18 months as part of routine well-child care. Research shows autism traits are reliably detectable at this age in many children, making it a critical window for early identification. Early diagnosis enables earlier intervention during the most neuroplastic period of development.
- My child's doctor didn't offer the M-CHAT-R at the 18-month visit. Can I still screen?
- Yes. You can complete this online version based on your own observations at home. If the result is positive, bring it to your paediatrician as a starting point for a referral conversation. You do not need a clinician to administer the M-CHAT-R.
- What happens if my child screens at risk?
- A positive screen means enough reported behaviours are present to warrant further evaluation. The recommended next step is a referral to a developmental paediatrician, paediatric psychologist, or specialist autism diagnostic service. Early referral leads to earlier access to support.
- Does a positive screen mean my child has autism?
- No. A positive screen is not a diagnosis. Many children who screen positive do not receive an autism diagnosis after full evaluation. Only a qualified clinician carrying out a comprehensive assessment can diagnose autism spectrum disorder.
- How long does the screening take?
- Most parents complete the M-CHAT-R in 3 to 5 minutes. Results and guidance are available immediately after the last question.
Free · Private · Results in under 15 minutes