At home they never stop talking: they tell stories, sing, argue with their sibling, ask you a thousand questions. But then you get to the meeting with the teacher and she tells you something that doesn't match the child you know: 'in class she doesn't say a single word'. Not even to ask to go to the toilet, or to answer when spoken to. As if she were a different child.
If that sounds familiar, it may not be shyness or stubbornness. There's an explanation with a name of its own: selective mutism. In this article I'll explain what selective mutism is, why your child can talk in one place and go silent in another, which signs give it away and, above all, how you can help.
Selective mutism: what it is exactly
Selective mutism is an anxiety disorder that appears in childhood. The child has normal language and speaks fluently in the settings where they feel safe -usually at home, with close family- but is unable to speak in certain social situations, very often at school or with people they don't know well. The American Psychological Association places it precisely among the anxiety disorders, not the language problems. The child knows how to talk; what they can't do is talk when anxiety switches on.
It isn't shyness or stubbornness
Here's the most common misunderstanding, and the one that does the most harm. Selective mutism isn't that the child 'won't' talk: it's that they 'can't'. It isn't a decision or a stunt to get attention, and it isn't the same as being shy. A shy child takes time to warm up, but ends up talking; a child with selective mutism freezes again and again in the same kind of situation. Understanding this difference changes everything: you stop thinking 'they'll grow out of it' or 'how rude' and start seeing a child who is having a hard time.
Why selective mutism appears
There's usually an anxious baseline and a rather inhibited or cautious temperament: children who were very watchful from an early age and who need their time with anything new. On that base, when the child faces a situation that causes distress (speaking in class, an adult asking them something), the body reacts as if to danger and speech 'freezes'. And because going quiet lowers the distress immediately, silence becomes a safety behaviour that repeats and grows stronger. It isn't laziness or manipulation: it's fear.
The signs of selective mutism
Selective mutism stands out because the contrast between settings is so sharp.
How it shows at school and at home
- Talks normally at home and goes silent at school (or the reverse, in rare cases).
- Has a 'frozen' expression, avoids eye contact or stays still when spoken to.
- Communicates by gestures, pointing or whispering to a trusted person.
- May not speak to some relatives or to children they don't know well enough.
- Struggles to eat, ask for help or go to the toilet at school so as not to have to talk.
Selective mutism and anxiety
Selective mutism belongs to the anxiety-disorder family and rarely comes alone. It very often goes hand in hand with general childhood anxiety and, in many cases, with social anxiety: the intense fear of being judged or making a fool of oneself. In fact, as the child grows, selective mutism and social anxiety look more and more alike. That's why treating mutism means, at heart, learning to manage fear.
What age it appears and how long it lasts
Selective mutism usually becomes visible between the ages of 3 and 6, often when the child starts school and is asked, for the first time, to speak in a setting full of new faces. At first it's easy to mistake for the normal settling-in period. The difference is time: if after about a month the child still isn't saying a single word in that setting, it's no longer settling in. Without help it can last for years, but with early intervention the outlook is very good.
Selective mutism, shyness or school refusal?
It's worth not mixing concepts up. Shyness is a trait that fades with confidence. School refusal is the intense fear of going to school, with resistance to attending. Selective mutism, by contrast, doesn't stop the child from going to class -they go, do the tasks, play- but they don't talk there. A child can have both selective mutism and anxiety about going to school, but they're different things and it's worth telling them apart to get the help right.
When to seek help
It's worth seeing a professional when the lack of speech:
- Lasts more than a month, beyond the initial settling-in at school.
- Stays steady over time and doesn't improve on its own.
- Interferes with learning, with friendships or with the child's day-to-day life.
- Causes them clear distress or makes them avoid activities.
There's no need to wait until 'they'll talk when they're older'. The earlier you act, the easier it is to undo the cycle, because silence hasn't yet settled in as a habit of many years.
How to help your child at home
Your attitude as a parent is a key part of the treatment. The underlying idea: take pressure off, don't add it.
Guidance for parents
- Don't force them to talk or say 'say hello' in front of everyone: anxiety rises and silence gets stronger.
- Don't introduce them as 'the shy one' or always answer for them; give them time and options.
- Celebrate the small steps: a gesture, a whisper, a word to someone new. It all counts.
- Lower the child's overall anxiety with routines, play and emotional regulation.
- Look after their self-esteem: don't let them identify as 'the one who doesn't talk'.
- Coordinate with the school so you're all pulling in the same direction.
The school's role
The school isn't the problem, it's part of the solution. It helps a lot to have a go-to person the child feels comfortable with, not to make them speak in public or read aloud in front of the whole class, and to set very small, gradual steps (first talking to a trusted classmate, then in a small group…). Sharing a common set of guidelines with the teacher stops silence being reinforced by accident. If you find it hard to manage the anxiety all this stirs up in you, the guide to managing anxiety may help.
How selective mutism is treated
The good news is that selective mutism can be treated and responds very well, especially when caught early. It's worked on with cognitive behavioural therapy and, above all, with gradual exposure: easing the child towards speaking in situations that are each a little more demanding, always at their own pace and without forcing, so that anxiety drops and speech comes back naturally. The UK's National Health Service (NHS) notes that treatment is effective and that a younger starting age works in your favour. The work is always done with the family and the school as a team; the World Health Organization stresses that anxiety disorders improve with the right approach, in time.
How therapy helps
In therapy we don't 'make the child talk': we create the conditions for the fear to ease so that speech comes on its own. We work on the underlying anxiety, design the exposure steps with you and with the school, and make sure the child experiences each advance as a success rather than a test. I do this as a psychologist specialising in child therapy, and also through online therapy, in Spanish or Catalan, supporting families throughout.
If your child talks at home but goes silent outside it, don't wait for time to sort it out on its own. Get in touch for a first assessment with no obligation. With support, most children get their voice back -the one they already use at home- outside it too.