Autism Assessment for Toddlers in the UK: What Age, What to Expect, and How to Get One
If you have concerns about your toddler’s development — their communication, social responses, or behaviour — it is natural to wonder whether an autism assessment might be appropriate and, if so, whether your child is old enough. The short answer is: children can be assessed from around 18 to 24 months, and early identification almost always leads to better outcomes.
This guide explains what to look for in very young children, at what age assessment is possible, and how to get the process started in the UK.
What age can a child be assessed for autism in the UK?
A reliable autism diagnosis can be made from around 18 to 24 months of age, though most assessments in the UK take place from age two to three onwards. Some children are diagnosed at 18 months; many are not identified until school age or later.
There is no upper age limit for an autism assessment. Children can be assessed at any age — and adults are increasingly seeking diagnosis too. But early assessment is particularly valuable because early intervention, when it is tailored to a child’s individual needs, can have a significant and lasting impact on development, communication, and wellbeing.
What signs in toddlers might suggest autism?
No single sign indicates autism, and the presence of one or even several of the following is not diagnostic on its own. However, these are signs that developmental professionals would want to explore further:
By 12 months
- Not responding to their name being called
- Not babbling or making communicative sounds
- Not pointing, waving, or using other gestures
- Limited eye contact
By 18 months
- No single words (unless your child has had words and then lost them — this is particularly significant)
- Not engaging in simple pretend play (for example, pretending to drink from a cup)
- Not following a pointing gesture to look at something across the room
- Very limited interest in other children
By 24 months
- Fewer than 50 words, or loss of previously acquired language
- Not combining two words spontaneously (for example, “more juice” or “daddy go”)
- Consistent preference for solitary play over interactive play
- Significant distress at changes in routine
- Repetitive movements — hand-flapping, rocking, spinning objects — that are persistent and frequent
- Strong sensory responses to textures, sounds, or touch
- Lining up toys or objects rather than playing with them imaginatively
It is important to remember that autistic toddlers vary enormously. Some are very communicative and verbally advanced; others have significant language delays. Some are highly social; others prefer solitary exploration. Autism is a spectrum, and no single checklist captures every autistic child.
How do I get an autism assessment for my toddler?
Via the NHS
Start by speaking to your GP or health visitor. Either can refer your child to a community paediatrics team or a dedicated neurodevelopmental service for assessment. In some areas, early years professionals such as nursery staff can also trigger a referral.
NHS waiting times for autism assessment are currently very long — typically one to three years in most parts of England. This is not a reason to wait before making the referral; it is a reason to make the referral as soon as possible.
Whilst waiting, read our guide on what to do during the wait for an autism assessment — there is a great deal you can do in the interim to support your child and access services without a diagnosis in place.
Via school or nursery
If your child attends nursery, the nursery’s SENCO (Special Educational Needs Coordinator) can make referrals and put early support in place under the SEND Code of Practice. Nurseries and early years settings have the same duty to identify and support children with additional needs as primary schools do.
Privately
Private autism assessments for toddlers are available from around age two. The process for young children is adapted to their developmental stage — it is much more play-based than an assessment for an older child or adult, and parents play a central role in providing information.
Private assessments for very young children will typically involve the ADOS-2 (Toddler Module or Module 1, depending on age and language level) alongside a detailed parent interview and developmental history. Read our full guide on what happens during a private autism assessment for more detail.
For cost information, see our guide on how much a private autism assessment costs in the UK.
What happens at the assessment for a toddler?
Assessments for very young children are designed to be child-friendly and low-pressure. Your child will not be put in an unfamiliar room and asked to perform tasks. Instead, the clinician will spend time playing with your child and observing how they naturally communicate, play, and interact.
You will be a central part of the session. The clinician will ask you detailed questions about your child’s development and will observe how your child responds to you. For many toddlers, the session looks very much like play — which is intentional.
The assessment typically includes a thorough developmental history interview with parents, a structured play observation, and may also involve input from your child’s nursery or health visitor. A full written report will follow, with any diagnosis clearly stated and recommendations for support.
What happens if autism is identified early?
Early identification opens the door to early intervention — which decades of research consistently link to better outcomes in communication, learning, and quality of life. A diagnosis in hand allows you to:
- Access specialist early years support through your local authority
- Apply for additional funding at nursery through the Disability Access Fund or Inclusion Fund
- Begin an Education, Health and Care (EHC) needs assessment if your child has complex needs
- Access speech and language therapy, occupational therapy, and other specialist support sooner
- Connect with families in similar situations — which can be an enormous source of support
What if autism is not confirmed?
If the assessment concludes that autism is not indicated, a good clinician will still provide a full written report and — if there are clear developmental concerns — suggestions for further investigation or alternative support pathways. An assessment with a negative outcome is never a waste of time if your concerns were genuine.
