“Something feels different, but I don’t know what.” Maybe your child doesn’t respond the way other children do. Maybe eye contact feels limited, or speech is delayed. You’re asking yourself the hardest question: does my child have autism? This guide gives you the clearest possible answer to how to know if your child has autism.
How to know if your child has autism: You cannot know for certain without professional assessment — only a developmental paediatrician can diagnose autism. But key signs include: not responding to name (hearing normal), limited eye contact, speech delay, not pointing to share interest, repetitive behaviours, and strong insistence on routines. If you notice these, take the free M-CHAT test at mchatscreen.com and seek a specialist referral immediately — don’t wait.
1. Can You Know at Home — The Honest Answer
You can observe signs that warrant investigation, but you cannot know if your child has autism without professional assessment.
- What you can do at home: Observe development against milestones; take the free M-CHAT (16–30 months); document specific examples with video; compare notes with your paediatrician.
- What only a specialist can do: Formally assess using ISAA, ADOS-2, or CARS-2; rule out other conditions (hearing loss, speech delay, ADHD); give an official diagnosis enabling therapy access and government benefits.
2. Key Signs of Autism at Every Age
| Age | Signs Worth Investigating | Urgency |
|---|---|---|
| 6–9 months | No social smile; limited eye contact; no babbling | Mention at next visit |
| 12 months | No pointing; no waving; no response to name; no back-and-forth sounds | Seek paediatrician referral |
| 18 months | No meaningful words; no pointing at things they find interesting; limited imitation | Urgent specialist referral |
| 24 months | Fewer than 50 words; no 2-word phrases; limited eye contact; repetitive play; routine insistence | Urgent — do not delay |
| 3–5 years | Difficulty with peer relationships; unusual speech patterns; rigid routines; sensory sensitivities | Specialist referral |
| Any age | Loss of previously acquired language or social skills | Same-day/next-day appointment |
3. The 3 Core Areas of Autism — What to Observe
1. Social Communication
Does your child make eye contact naturally during play? Do they share things with you — pointing, showing, looking at you to share a moment? Do they respond to their name?
2. Social Interaction
Is your child interested in other people for genuine interaction? Do they enjoy playing with others? Can they read facial expressions and social cues?
3. Restricted/Repetitive Behaviours
Are there repetitive movements (hand-flapping, rocking)? Intense focus on specific topics? Strong insistence on routines? Unusual sensory responses to sounds, textures, or light?
Autism involves persistent differences across all three areas — not just one. It is the combination and persistence of differences that characterises autism.
4. Autism vs Normal Development — What’s the Difference?
| Situation | Could Be Normal | Red Flag for Autism |
|---|---|---|
| Doesn’t like strangers | Stranger anxiety is normal in all toddlers | Avoids family members and primary caregivers too |
| Plays alone | Independent play is healthy | Shows no interest in other children at all |
| Sensitive to sounds | Startle responses are normal | Extreme distress from everyday sounds; hands over ears routinely |
| Special interests | Deep interests are healthy | Intensity excludes all other activities; extreme distress if interrupted |
| Speech delay | Bilingual children, “late talkers” who use gestures | No compensatory gestures; no pointing; social interaction also affected |
5. Autism Checklist — How to Document Your Observations
- Video clips: 3–5 clips of typical behaviour at home — meals, play, interactions
- Written notes: Specific examples with approximate dates
- Milestone history: When did first words appear? Any regression?
- M-CHAT result: Complete the free M-CHAT at mchatscreen.com (for 16–30 month olds) and bring the result
6. First Signs of Autism You Should Never Ignore
- 🚨 Language regression: Child had words and has lost them — at any age
- 🚨 No response to name by 12 months — hearing is normal
- 🚨 No pointing by 12 months
- 🚨 No words by 16 months
- 🚨 No 2-word phrases by 24 months
- 🚨 Loss of social engagement — child who was social has become withdrawn
These are red flags recognised by the American Academy of Pediatrics, Indian Academy of Pediatrics, and NIMHANS as requiring immediate professional evaluation.
7. Step-by-Step: What to Do Next in India
- Take the M-CHAT online today
For children 16–30 months: go to mchatscreen.com and complete the free 5-minute screening. Note your result.
- Book a paediatrician appointment this week
Bring your M-CHAT result, video clips, and written observations. Request a referral to a developmental paediatrician.
- Start speech therapy now
Don’t wait for a diagnosis. Speech and communication support should begin immediately if there is any speech delay.
- Contact a specialist centre
Action for Autism India: 011-45565700. NIMHANS: 080-46110007. AIIMS Delhi: 011-26588500. National Trust: nationaltrust.nic.in
- Take care of yourself
Parent mental health matters. Seek support from other autism parents or a counsellor during this stressful period.
How to Know If Child Has Autism — Complete Guide
How to know if my child has autism: Watch for speech delay, limited eye contact, no response to name, no pointing, repetitive behaviours, and routine insistence. Use the free M-CHAT at mchatscreen.com. Seek developmental paediatrician assessment. First signs of autism in a child: No social smile (6 months), no babbling (9 months), no pointing or waving (12 months), no words (16 months), no 2-word phrases (24 months), skill regression at any age. Can I tell if my child has autism without a doctor: No — only a qualified specialist can diagnose autism. Online tools screen for risk; they do not diagnose. How to check for autism at home: Use M-CHAT for toddlers; observe the three core areas; document with video and notes; bring observations to your doctor. Autism checklist India: No name response, limited eye contact, no pointing, speech delay, repetitive behaviours, routine insistence — significant concerns in these areas warrant professional evaluation.
Understand Your Child’s Profile While You Wait for Assessment
Our free tool helps you map your child’s sensory and communication profile right now — giving you practical information to share with specialists and act on today.
Free Sensory Profile & Support Tool for Parents →Frequently Asked Questions
How do I know if my child has autism?
What are the very first signs of autism?
Can I tell if my child has autism without a doctor?
How can I prepare for my child’s autism assessment in India?
What’s the difference between autism and normal toddler behaviour?
Sources: DSM-5, CDC Developmental Milestones, AAP, Indian Academy of Pediatrics, NIMHANS, Action for Autism India.