What are the earliest signs of autism?

Common early signs by 12–18 months include not responding to their name, limited eye contact, few or no gestures like pointing or waving, loss of previously used words, and limited shared attention (not showing you things or following your point). One sign alone isn't a diagnosis. Patterns across areas are what matter.

At what age can autism be diagnosed?

Autism can often be reliably diagnosed by age 2, and evaluation can begin as soon as concerns appear. Early diagnosis matters because early intervention produces the strongest outcomes. ABA therapy can begin as young as age 1.

What should I do if I notice signs of autism?

Write down specific examples, raise them directly with your pediatrician, ask for an autism evaluation referral, and for children under 3 contact your state's early intervention program (Baby Watch in Utah, Infants & Toddlers in Maryland). Acting early is never a mistake; waiting to 'see if they grow out of it' can cost valuable months.

Getting Started

Early Signs of Autism by Age: What to Watch For (and What to Do)

By the Golden Touch ABA clinical team · August 25, 2026 · 7 min read

Nobody knows your child like you do. When something feels different about how they communicate, play, or connect, that feeling deserves attention, not dismissal. Here are the signs clinicians look for at each age, and what typical variation looks like alongside them.

One sign is not a diagnosis. Children develop at different speeds. What matters is a pattern across several areas, and if you see one, the right move is an evaluation, not more waiting.

Around 12 months

Doesn't respond consistently to their name
Little or no babbling, pointing, waving, or reaching to be picked up
Limited eye contact during feeding and play
Doesn't follow your point or look where you look

By 18–24 months

Few or no single words by 16 months; no two-word phrases by 24 months
Loss of words or skills they previously had, which is always worth evaluating promptly
Doesn't bring things to show you or share enjoyment
Repetitive movements (hand-flapping, spinning, rocking) or intense attachment to specific objects
Strong distress at small changes in routine

Ages 3–5

Prefers playing alone; limited pretend play
Difficulty with back-and-forth conversation, even with growing vocabulary
Repeats phrases or scripts from shows rather than generating language
Big reactions to sounds, textures, or lights
Meltdowns around transitions that don't ease with age

School age

Wants friends but struggles to make or keep them
Takes language very literally; misses sarcasm and social cues
Deep, narrow interests that dominate conversation
Rigid routines; distress when rules or plans change

What to do next

Write down specific examples of what you're seeing.
Raise them with your pediatrician and ask directly for an autism evaluation referral.
Under 3? Contact early intervention now (Baby Watch in Utah, Infants & Toddlers in Maryland). It's free and doesn't require a diagnosis.
Read our step-by-step guide to getting evaluated, or see what support could look like for your child.

The research is unambiguous on one point: earlier is better. Early intervention changes trajectories, and acting on your instinct is never the wrong move.