Speech delay or autism? How to tell the difference
Not every late talker is autistic, and not every autistic child is late to talk. Here is what actually distinguishes a speech delay from autism in toddlers.
“He’ll talk when he’s ready” is the single most common piece of advice given to parents of late-talking toddlers. Sometimes it is right. Often it delays support by a year or more.
The useful question is not how many words your child has. It is what your child does with communication when they have no words available.
Start here: the pointing test
At around 12 to 15 months, typically developing children begin to point at things purely to share them. Not to request. To show.
A child sees a dog and points at it while looking back at your face to check that you saw it too. That loop — object, point, look at parent, look back at object — is called joint attention, and it is one of the most informative behaviours in early development.
A late talker who is not autistic still does this. They cannot say “dog”, so they point harder, drag you over, make noises, show you things constantly. The drive to share is intact; only the words are missing.
An autistic toddler more often does not. They may take your hand and place it on the fridge handle, using you as a tool to get an outcome, without the shared-moment quality.
This distinction — communication as tool versus communication as connection — is the clearest single differentiator available to parents.
Side by side
| Behaviour | Late talker (non-autistic) | Possible autism |
|---|---|---|
| Pointing to share | Yes, frequently | Rare or absent |
| Responding to name | Consistently | Inconsistent, even in quiet |
| Gestures | Many: waving, nodding, reaching, miming | Few; may use adult’s hand as a tool |
| Eye contact | Typical for the child | Reduced, fleeting or unusually intense |
| Pretend play | Feeds the doll, drives the car | Spins wheels, lines up, sorts by colour |
| Imitation | Copies actions, faces, songs | Little spontaneous copying |
| Interest in other children | Watches them, wants to join | Largely indifferent, or plays alongside only |
| Comprehension | Understands much more than they say | Often understands less than expected |
| Response to frustration | Frustrated at not being understood | May not attempt to be understood |
No single row decides anything. The pattern across the whole table is what matters.
Signs the delay is just a delay
Reassuring signs, taken together:
- Understands instructions well (“get your shoes”, “where’s Daddy?”)
- Communicates constantly without words — pointing, pulling, showing, gesturing
- Has real back-and-forth: peekaboo, rolling a ball, chase games
- Babbles with varied sounds and conversational intonation
- Imitates you spontaneously
- Vocabulary is growing steadily, even if behind
- Family history of late talking with typical outcomes
Late talkers with strong comprehension and social drive have a good prognosis, and many are indistinguishable from peers by school age.
Signs that point towards autism
- Words appeared and then disappeared (regression) — always report this promptly
- Repeats phrases from videos out of context (echolalia)
- Uses the same word or phrase for many different meanings
- Talks at you, not with you
- No pretend play by 24 months
- Repetitive movements, lining up, intense need for sameness
- Marked sensory reactions to noise, texture, light or food
Echolalia deserves a note. Repeating chunks of speech is a genuine communication strategy, not meaningless. Many autistic children learn language in whole phrases (gestalt language processing) rather than word by word, and those phrases carry real meaning — “to infinity and beyond” may mean “I want to go outside”. It is a stage to be worked with, not stamped out.
Other explanations to rule out
Before assuming either answer, exclude:
Hearing loss. Glue ear is extremely common in toddlers and can fluctuate. Every late-talking child needs a hearing test — no exceptions.
Developmental language disorder (DLD). Persistent language difficulty without the social differences of autism. Affects around 7% of children and is under-recognised.
Childhood apraxia of speech. The child knows what to say and cannot coordinate the movements to say it. Typically accompanied by high frustration and strong communicative intent.
Global developmental delay. Delay across several domains rather than language alone.
Multilingual homes. Growing up with two or more languages does not cause language delay. Total vocabulary across languages is what counts. Do not let anyone advise you to drop a home language.
What to do now
In the next two weeks:
- Book a hearing test. First step, always.
- Request a speech and language therapy assessment. In most systems you can self-refer.
- Log the social behaviours, not just word counts: pointing, showing, pretend play, responding to name.
- Film 60 seconds of play. Clinicians learn more from that than from any questionnaire.
- Ask for a developmental review if the social behaviours are absent as well.
Requesting a speech assessment and an autism screen at the same time is not premature. If it turns out to be a straightforward delay, you have lost nothing.
What helps either way
These strategies support communication regardless of the eventual diagnosis:
- Narrate everything at a level slightly above your child’s — one to two words longer than their utterances
- Pause and wait. Count silently to five. Many parents fill the gap before the child can take a turn.
- Get face to face at their eye level rather than talking from across the room
- Create communication opportunities — put a favourite item in view but out of reach
- Follow their lead. Join whatever they are doing rather than redirecting them
- Accept all communication — pointing, signing, pictures. Using signs and symbols does not delay speech; the evidence shows it supports it.
If your child has very little spoken language, supporting non-speaking communication covers AAC and other tools in depth. If you are noticing broader differences too, start with our early signs checklist.
A note on this article. Nomi publishes educational information for parents. It is not medical advice and cannot replace assessment by a qualified clinician.
Frequently asked questions
How many words should a 2-year-old have?
Around 50 words and some two-word combinations such as 'more milk' by 24 months is the usual benchmark. Having fewer is a reason for a speech and language assessment, not automatically a sign of autism.
Can a child be a late talker and not autistic?
Yes, and most are. Late talkers who point, share, pretend, imitate and seek out interaction usually catch up, sometimes with speech and language therapy support.
Do autistic children always have a speech delay?
No. Some autistic children speak early and fluently. Their differences show up in how language is used socially — turn-taking, topic flexibility and reading tone — rather than in vocabulary size.
Should I wait to see if my child catches up?
Get a hearing test and a speech and language assessment now rather than waiting. Both are low-risk, and early support helps regardless of the eventual explanation.
Keep reading
Early Signs of Autism in Toddlers: A Parent's Checklist
The early signs of autism in toddlers, broken down by age from 12 to 36 months — what they look like in real life, and when to ask for an assessment.
Signs of Autism in Girls (and Why They Get Missed)
Autistic girls are diagnosed later and less often than boys. Here is what autism looks like in girls, why masking hides it, and how to get taken seriously.
Non-Speaking Autism: How to Support Communication
How to support a non-speaking or minimally speaking autistic child — AAC, PECS, signing and everyday strategies, plus the myths that hold children back.