Speech delay or autism? How to tell the difference

This is the question that brings more parents to us than any other. Your child is two, or three, and not talking. You have searched online, and now you are frightened in a way you were not before you searched.

Here is the useful thing to know: the difference between a speech and language delay and autism is generally not found in the words. It is found in everything around the words.

The question that separates them

A child with a speech and language delay usually wants to communicate very much and cannot find the means. So they use everything else available to them. They point insistently. They take your hand and lead you to what they want. They bring you things. They look at your face to check you have understood. They get visibly frustrated when you have not, because the intention to reach you was fully there and it failed.

In autism, the difference is more often in the social communication itself, not only in its output. There may be less pointing to share interest, less checking your face, less bringing things over simply to show you. The drive to share attention with another person, rather than to obtain an object, works differently.

So the question worth asking is not "how many words does my child have?" It is: when my child wants something, or notices something interesting, what do they do?

Things that point towards a language delay alone

• Strong non-verbal communication: pointing, gesturing, leading, showing, miming.
• Clear frustration at not being understood, which means the intention to be understood was there.
• Typical, warm social interest: seeks you out, enjoys other children, shares attention readily.
• Understanding that is well ahead of speech.
• Imaginative, pretend play: feeding a doll, making a block into a phone.
• Responds to their name reliably.
• Copies what other people do.

Things that raise the question of autism

• Limited pointing or showing, particularly pointing purely to share something interesting.
• Inconsistent response to their name, when hearing is fine.
• Little checking of your face for a reaction.
• Repeating phrases from cartoons or adults rather than generating their own, though echolalia is communication, not noise.
• Playing with parts of objects rather than with objects; lining things up with real intensity.
• Distress at small changes to routine.
• Repetitive movements: flapping, rocking, spinning, toe-walking.
• Marked sensory differences: covering ears, distress at textures, or seeking out crashing and spinning.
• Little interest in other children, or interest that does not become play.

The other possibilities people forget

Hearing loss is the big one, and it is regularly overlooked. Glue ear, which is fluid behind the eardrum after repeated ear infections, is extremely common in young children and causes a fluctuating hearing loss that is more than enough to disrupt speech development at exactly the wrong age. Children with glue ear often seem to hear perfectly well much of the time, which is precisely why it is missed. Have hearing tested properly before anything else.

Then there is childhood apraxia of speech, where a child knows exactly what they want to say but the brain struggles to sequence the movements to say it. There is developmental language disorder, a specific difficulty with language in a child who is developing typically otherwise. And there is selective mutism, where a child speaks freely at home and not at all in other settings, which is anxiety, not defiance, and responds to entirely different work.

This is exactly why the answer to "which is it?" is an assessment rather than a checklist. These need genuinely different responses.

What does not cause speech delay

Speaking more than one language at home does not cause speech delay. This myth leads families in Quetta to drop Pashto, Balochi, Brahui or Urdu unnecessarily, which costs a child their connection to their family and does not help their speech. Multilingual children may mix languages early; that is normal and it passes. A genuine delay shows up in all of a child's languages, not just one.

Being a boy does not cause it either, and neither does having older siblings who talk for them. Both are offered as reassurance constantly. Neither is a reason to wait.

What to do, in order

• Have hearing tested properly. Not a guess, an actual test.
• Book a speech and language assessment without waiting for the hearing result.
• In the meantime, cut the questions and comment instead. Narrate what your child is doing. Give words without demanding them back.
• Wait longer than feels comfortable after you speak. Count silently to ten. Adults almost always fill the gap before a child gets there.
• Expand rather than correct. If your child says "car go", say "yes, the car is going!" and the right form is modelled without them being told they were wrong.