Early Signs of Autism

Early Detection

Why Early Recognition Matters

Research shows that autism can be reliably detected as early as 18 months of age, and sometimes earlier. The earlier autism is identified, the sooner intervention can begin — and early intervention leads to significantly better outcomes in communication, social skills, and overall development.

Every child develops at their own pace, so missing one milestone doesn't necessarily mean your child has autism. However, if you notice several of the signs listed below, it's important to talk to your pediatrician right away.

By Age

Signs to Watch For

What to look for at each developmental stage.

6–12
mos

6 – 12 Months

⚠️
Limited or no eye contact with parents or caregivers
⚠️
No social smiling or smiling back when smiled at
⚠️
No babbling (ba-ba, ma-ma sounds) by 12 months
⚠️
Doesn't respond to their name being called
⚠️
Doesn't reach to be picked up
⚠️
Doesn't follow objects visually or point at things

12–18
mos

12 – 18 Months

⚠️
No single words by 16 months
⚠️
No pointing, waving, or gestures by 12 months
⚠️
Doesn't show interest in other children
⚠️
Doesn't bring objects to show to parents
⚠️
Repetitive movements (rocking, spinning, hand-flapping)
⚠️
Unusual attachment to specific objects

18–24
mos

18 – 24 Months

⚠️
No two-word phrases by 24 months (e.g., "want milk")
⚠️
Loss of previously acquired speech or social skills
⚠️
Doesn't engage in pretend play (feeding a doll, talking on a phone)
⚠️
Lines up toys or objects instead of playing with them
⚠️
Extreme distress over small changes in routine
⚠️
Unusual reactions to sounds, textures, or lights

2–3
yrs

2 – 3 Years

⚠️
Difficulty understanding simple instructions
⚠️
Doesn't play with other children or shows no interest in peers
⚠️
Echoes words or phrases instead of using original language (echolalia)
⚠️
Walks on toes or has unusual body movements
⚠️
Very limited diet — extremely selective eating
⚠️
Difficulty with transitions or changes in schedule

3+
yrs

3+ Years

⚠️
Avoids or struggles with group activities at school or daycare
⚠️
Difficulty understanding feelings — their own or others'
⚠️
Intense, focused interests in specific topics
⚠️
Difficulty with imaginative or cooperative play
⚠️
Unusual speech patterns (monotone, sing-song, scripted)
⚠️
Challenging behaviors (meltdowns, aggression, self-injury)

🚩 Red Flags

Critical Red Flags at Any Age

If you observe any of these, contact your pediatrician immediately.

🚩
Loss of any previously acquired skills — speech, babbling, gestures, or social engagement
🚩
No babbling by 12 months
🚩
No gestures (pointing, waving) by 12 months
🚩
No single words by 16 months
🚩
No two-word meaningful phrases by 24 months
🚩
No response to name by 12 months despite normal hearing
🚩
Lack of interest in other children or social interactions

Remember: This checklist is not a diagnostic tool. Only a qualified professional can diagnose autism. If you have concerns, early screening and evaluation is always the right choice — you have nothing to lose and everything to gain.