Last updated 26 October 2026 · 9 min read · By Sarah M., Support Coordinator
In short
Signs of autism in a 2 year old can show up in how they communicate and interact: a toddler might not, or only sometimes, respond to their name, use gestures such as waving, or use eye contact to share interest (Raising Children Network). Only a health professional can say whether a child is autistic.
This guide covers what to look for at ages 2 and 3, how to raise concerns and what support exists in Australia. For the wider picture, see our guide to the symptoms of autism.
Key points
Early signs of autism usually become noticeable during the first 1-2 years of life, though every child is different.
Autism can be diagnosed between 12 and 18 months, but diagnosis is usually from around 2 years of age.
If you are worried, you do not need to wait for a diagnosis to ask about support; talk to your GP or child health nurse early.
Support may be available through the NDIS early childhood approach and Thriving Kids, which is being rolled out from 2026, and the free Autism Connect helpline can point you to the right place.
Signs of autism in 2 year old children at a glance
What it is
A lifelong difference in how a child communicates, plays, relates to others and experiences the senses
When signs show
Usually noticeable during the first 1-2 years of life
When diagnosis can happen
Between 12 and 18 months is possible; usually from around 2 years of age
Who to see first
Your GP or child health nurse, who can refer you for a developmental assessment
Free helpline
Autism Connect on 1300 308 699, 8am to 7pm Monday to Friday
Signs are usually about differences in everyday interaction, not one single behaviour, and a few signs on their own do not mean a child is autistic.
Area
What you might notice
Strengths some children show
Responding to others
Does not, or only sometimes, respond to their name
Deep focus on what interests them
Gestures
Does not often use gestures such as waving
Other ways of showing what they need
Eye contact
Uses eye contact less to share interest or enjoyment
Notices small details others miss
Play
Might play in repeated or unusual ways
Persistence and memory for patterns
Senses and routines
Might react strongly to sounds, textures or changes in routine
May feel settled with predictable, calm routines
Autism symptoms in toddlers: how to spot and detect early signs
You know your child’s usual patterns well, so your observations are a useful starting point.
Watch how your child shares attention: do they look at you, point to things they like or bring you toys to show you?
Note whether they respond when you call their name in a quiet room, and try on different days.
Write down examples with dates, such as videos or notes of play, to bring to the appointment.
Try the free ASDetect app, developed by La Trobe University, which checks early signs in children aged 11-30 months (Raising Children Network).
Remember that an app or checklist is for reflection only; only a qualified professional can assess your child.
Signs of autism in a 2 year old girl or boy
Signs can look different from child to child, and no single sign belongs only to boys or only to girls.
If you notice signs of autism in a 2 year old girl, raise your concerns even if your daughter seems social.
Autism in a 2 year old boy looks different in each child, so describe what you see rather than compare him with others.
For autism in 2 year old girls and boys alike, note how your child responds to their name, uses gestures and uses eye contact to share interest.
If your child’s development has changed or stopped progressing, mention this to your GP promptly.
Signs of autism in a 3 year old boy or girl
Signs in a 3 year old vary from child to child, so note what you see in different places.
Autism in a 3 year old boy or girl can look different in each child, so write down specific examples rather than comparing with siblings or friends.
Look for 3 year old autism signs across settings: home, childcare, playgroup and family gatherings.
Ask childcare educators what they notice, as their observations can support your GP or paediatrician’s assessment.
Looking for NDIS support at home?
TQN Care support workers help with personal care, community access, respite and help around the home across Sydney, Melbourne and surrounding areas (NSW & VIC). Tell us what you need and we will call you back.
When does autism show, and what age does autism present?
Early signs usually become noticeable during the first 1-2 years of life, but timing varies, and some children are identified later (Raising Children Network).
Autism can be diagnosed between 12 and 18 months, but diagnosis is usually from around 2 years of age.
For ASD in toddlers, a diagnosis is made by qualified health professionals after a developmental assessment, not by a checklist.
You can start the process at any time, and getting information early does not lock you into anything.
1Book a longer GP appointment. Explain your concerns about communication, play or sensory reactions, and bring your notes and any videos.
2Ask about a referral. Your GP may refer you to a paediatrician or a team that carries out developmental assessments for young children.
3Ask about other checks. Ask your GP whether any other checks, such as a hearing check, are needed for your child.
4Contact support early. Call Autism Connect on 1300 308 699 for free information while you wait (Amaze).
5Keep records. Keep reports, letters and notes in one folder to share with therapists and funding bodies.
Support for ASD in toddlers and early years: NDIS and Thriving Kids
You do not need to wait for a formal diagnosis to ask what support is available for your child.
The NDIS early childhood approach is for children younger than 9 with delays in their development or disability, delivered by early childhood partners funded by the NDIA (NDIS).
Families can call the NDIS on 1800 800 110 to ask about the early childhood approach (page current as of 11 September 2026).
Thriving Kids is a national system of supports for children aged 8 and under with developmental delay and/or autism and low to moderate support needs (Department of Health, Disability and Ageing).
State services under Thriving Kids were due to begin no later than 1 October 2026, at scale from 1 January 2028; families can call the national phoneline on 1800 882 436 (Raising Children Network).
Support means helping your child feel safe and understood, and guiding behaviour with patience rather than punishment.
How to discipline a toddler with autism
Look for what the behaviour is communicating, such as a need for a break, a sensory overload or a change in routine.
Use short, calm words and visual cues like pictures to show what comes next.
Offer simple choices and notice what your child does well.
Ask your paediatrician, psychologist or occupational therapist for strategies suited to your child.
When to talk to a GP or specialist
Trust your instincts, and speak up early if something does not feel right; call 000 in an emergency.
Your child does not respond to their name, or does not wave, point or show you things.
Your child has lost words or skills they once had, or their development seems to have stalled.
Everyday sounds, textures or changes of routine cause intense distress that affects family life.
Childcare educators or family members have shared similar concerns about communication or play.
You feel worried, exhausted or overwhelmed; ask your GP for support for yourself too, and call Lifeline on 13 11 14 if you need to talk, or 000 if anyone is in immediate danger.
Looking for NDIS support at home?
TQN Care support workers help with personal care, community access, respite and help around the home across Sydney, Melbourne and surrounding areas (NSW & VIC). Tell us what you need and we will call you back.
If you are waiting for an assessment or building supports, practical help at home can ease the load on your family. TQN Care’s NDIS services include help around the home, community access and respite, and we work with your routines. Our support workers do not diagnose or treat; they support daily life. You can also read about signs of ADHD in toddlers.
SM
Sarah M., Support CoordinatorTQN Care is a registered NDIS provider supporting people across Sydney, Melbourne and surrounding areas (NSW & VIC).
Common questions
FAQs about autism symptoms in toddlers
What age does autism show? +
Early signs of autism usually become noticeable during the first 1-2 years of life. Autism can be diagnosed between 12 and 18 months, but diagnosis is usually from around 2 years of age. Some children are identified later, and every child develops at their own pace.
What are some signs of autism in toddlers? +
An autistic toddler might not, or only sometimes, respond to their name, use gestures such as waving, or use eye contact to share interest. Play, routines and sensory reactions may also look different. Only a health professional can assess whether your child is autistic.
How can I spot autism in toddlers? +
Watch how your child shares attention, responds to their name and plays, and write down examples. The free ASDetect app checks early signs in children aged 11-30 months. Take your notes to your GP, who can refer you for a developmental assessment.
How do I discipline a toddler with autism? +
Aim to understand what the behaviour is telling you, then respond calmly with routines, simple words and visual cues. Every child is different, so what works may change over time. Ask your paediatrician, psychologist or occupational therapist for strategies that suit your child.