If you are noticing that your child has selective mutism symptoms — silence in certain places, the child who talks freely at home but freezes elsewhere — it is worth understanding selective mutism properly. Maybe your child talks at home — properly talks, full sentences, tells you everything — but in other settings they go silent in a way that feels like more than shyness.
This post won't give you a diagnosis. Only a qualified professional can do that. But it will give you a clearer picture of what selective mutism actually looks like in practice, what points toward it and what points away from it, and what questions are worth asking before you take the next step.
The most important thing to establish first
Selective mutism symptoms have one defining feature that separates them from most other childhood communication difficulties: the child can speak. They do speak. Fluently, freely, normally — in the right context. The silence isn't about ability. It's about anxiety in specific situations.
If your child isn't speaking anywhere — not at home, not with you, not in any relaxed setting — that's a different picture and warrants a different conversation with your GP or SALT. Selective or Situational mutism is when speech is limited to certain contexts.
But if you have a chatty, funny, verbally capable child at home who becomes a different person the moment they hit a certain environment, that contrast is the hallmark of selective mutism.
Signs that point toward selective mutism
The silence is consistent and situational
The pattern is consistent: same settings, same people, same freeze. A child with selective mutism can sit in the same classroom with the same teacher for an entire school year without saying a word. Familiarity doesn't automatically unlock them, like it might with a shy child.
Ask yourself: where specifically does the silence happen? School only? With all adults outside the family? With peers but not with adults, or the other way around? SM tends to have a clear map. The silence isn't random. For us, our child only spoke to parents and grandparents, and her trusted nanny who looked after her from 9 months when I went back to work. Anyone else, including aunts, uncles, she would freeze and get distressed when asked a question.
The freeze overrides basic needs
This is one of the clearest indicators that you're dealing with something beyond shyness. A child who won't ask to go to the toilet even when they need to. Who won't call out if they're hurt. Who will sit through a lunch break without eating because they can't ask someone to help open their lunchbox.
The anxiety is so powerful it overrides discomfort. That's phobia-level, not personality. My child wet herself at school daily when she started reception because it was much easier that having to initiate or communicate the need to go to the toilet. I talk about that in another blog post.
The body gives it away
When a child with selective mutism is expected to speak, watch what happens physically. There's often a very specific response: they go still. The face becomes blank — which teachers sometimes misread as rude or uninterested. The shoulders stiffen. Eye contact disappears entirely.
This is the freeze response. The nervous system has flagged the situation as unsafe and shut down non-essential functions, speech included. A shy child might blush and fidget; they stay embodied. A child in an SM freeze looks different. My daughter would look down and go stiff.
They want to speak but can't
This is one of the most important distinctions. A child with selective mutism is not indifferent. They often show visible frustration or embarrassment at not being able to respond. They might mouth words, gesture, nod vigorously — doing everything except produce sound.
If your child seems trapped rather than unwilling, they very likely just can't speak.
They communicate non-verbally in settings where they won't speak
Nodding, pointing, whispering in someone's ear, passing notes, using a sibling as a voice proxy — these are all classic SM adaptations. The child is still trying to connect and communicate. They haven't withdrawn from the world.
Once my child's anxiety and freezing started to soften and she became more comfortable at school, it amazed me to see how she managed to laugh silently too. And she threw up once because she was absolutely terrified to cough audibly at school and the mucus piled up and....out it came.
There's a wider anxiety picture
SM rarely travels alone. Look for other anxiety signals: difficulty separating from you, physical complaints on school mornings (stomach aches, headaches), excessive worry, perfectionism, avoidance of situations where speaking might be expected — not going to parties, refusing phone calls, avoiding unfamiliar adults.
None of these on their own confirm SM, but together they build a picture.
It's been going on for more than a month
A settling-in period at a new nursery or school isn't SM. A bilingual child going through a silent period in their second language isn't necessarily SM. But if the pattern has persisted for more than a month — and the DSM-5 specifically excludes the first month of a new school year from that count — it's worth taking seriously.
The one question that does the most diagnostic work
If your child is engaged, absorbed in play, or laughing uncontrollably with someone — does speech ever break through? Even briefly, even accidentally?
A child who cannot produce voice even in moments of total absorption and joy is likely showing something more complex. A child whose voice slips out when they've forgotten to be afraid — that's the evaluative freeze that sits at the heart of selective mutism. The voice is there. The anxiety is what's blocking it.
I've seen this with my own daughter. There have been moments — mid-giggle, mid-game, fully absorbed — where words have come out before she's realised what's happened. Those moments are gold. They're also exactly the principle behind how intervention works: you create the conditions where the anxiety drops far enough for speech to be possible, and you build from there.
What points away from selective mutism
It's worth being clear about what doesn't fit the pattern, so you're not chasing the wrong thing and if any of these fit it's best seeking professional advice:
- Silence that's global — the same at home as everywhere else
- No clear situational pattern to the silence
- No signs of wanting to speak; indifference rather than distress
- Speech difficulties that are present at home too
- Silence that resolved quickly without any intervention
- Significant social difficulties beyond speaking — difficulty reading cues, strong preference for sameness, repetitive behaviours (these may point toward autism, which can co-occur with SM but is a separate conversation)
What to do next
You don't need a diagnosis to start helping your child. What they need now — before any referral comes through, before any professional puts a label on it — is for the pressure to speak to come down.
The GP route in the UK typically leads to a SALT referral, and not all SALTs specialise in SM. You may go around in circles like I did. If you want to understand what you're looking at and start building a strategy while you wait, SM Pocket Coach was built for exactly that: to give parents the frameworks they need to support their child now, not in three years.
If you're in the earlier stages and still trying to work out whether this is what's going on, my plain-English guide to what selective mutism is is the place to start. And if you're wondering about the overlap with autism, that's its own post.
You're not imagining it. And you don't have to wait.