Early Signs of Autism: What to Look For in Toddlers

Bahij Khouzami

BCBA · Board Certified Behavior Analyst

Why Early Identification Matters

The first three years of life represent a critical window for brain development. Research consistently shows that children who receive early intervention services — before age three — have significantly better long-term outcomes in language, social skills, and independence.

Identifying autism early gives families access to the support and strategies that make the greatest difference.

Common Early Signs

Every child with autism is different, but there are patterns that often appear in the first two years of life. Here's what to watch for:

Social Communication

• Limited eye contact or inconsistent eye contact
• Not responding to their name by 12 months
• Not pointing to show interest by 14 months
• Not waving or using other gestures
• Reduced or absent back-and-forth smiling with caregivers

Language Development

• No babbling by 12 months
• No single words by 16 months
• No two-word phrases (without imitation) by 24 months
• Loss of previously acquired language skills at any age

Repetitive Behaviors and Interests

• Lining up toys or objects repeatedly
• Unusual attachment to specific objects
• Repetitive motor movements (hand-flapping, rocking, spinning)
• Intense, narrow interests
• Distress over minor changes in routine or environment

What These Signs Do NOT Mean

Seeing one or two of these signs does not mean your child has autism. Development varies widely. Some children show several signs and do not receive an autism diagnosis; others receive a diagnosis with a different profile.

What these signs mean is: it's worth talking to a professional.

What to Do If You're Concerned

1. Talk to your pediatrician. Bring a list of your specific concerns and ask for a developmental screening.
2. Request a referral. If your pediatrician shares your concerns, ask for a referral to a developmental pediatrician, psychologist, or speech-language pathologist for a comprehensive evaluation.
3. Don't wait for a diagnosis to seek support. In many regions, early intervention services are available to children under 3 based on developmental delay — a formal autism diagnosis is not always required.
4. Reach out to a behavior analyst. A BCBA can help you understand what you're observing and guide you toward next steps.

A Note for Parents

Noticing potential signs of autism in your child can bring up a wide range of emotions. Know this: early concern and early action are among the most powerful things a parent can do. You are your child's greatest advocate.