Definition
Selective mutism is an anxiety disorder where a child speaks fluently in some settings (usually home) but is consistently unable to speak in others (usually school) for at least one month. It is recognised in DSM-5 and is not shyness, defiance, or a choice.
In context for parents
Key checkpoints
- Selective mutism is an anxiety disorder; a child speaks fluently in some settings (usually home) but is unable to speak in others (usually school) for at least one month (DSM-5).
- Affects around 1 in 140 UK primary-age children, typically with onset 3–5.
- The freeze is involuntary, not shyness, defiance, or choice.
- Maggie Johnson "small steps" framework and the sliding-in technique are the strongest evidence base (SMIRA-endorsed).
- Often meets the EHC needs assessment threshold where SLT input beyond school capacity is needed.
Selective mutism affects around 1 in 140 UK primary-age children, with a typical onset between 3 and 5, often noticed when nursery or school starts. The child's freeze response is involuntary: the same anxiety response that produces a "fight or flight" reaction produces, in selective mutism, a "freeze" of the voice. The longer the freeze becomes a known pattern, the harder it is to unfreeze.
In a Reception classroom, selective mutism looks like the child who chats happily in the playground at 8.50 a.m., goes silent the moment she crosses the threshold, and does not speak again for six hours. By Year 2 the silence has become identity (peers and staff have learned that "she doesn't talk at school") and the longer this lasts the more entrenched the freeze becomes. Approaches that demand speech (reward charts, "just say one word") make it worse.
What works: the Maggie Johnson "small steps" framework (now in the SMIRA-endorsed handbook), delivered by a SaLT or trained school staff member, with parental involvement. The sliding-in technique (a confident-talking adult, usually a parent, gradually transferring the child's verbal comfort into the school setting) has the strongest evidence base. Reducing direct verbal demands and using whisper voice, written and gestured responses, and one-to-one settings to scaffold rebuilding of speech.
The condition often meets the threshold for SEN Support and, where intervention beyond the school's capacity is needed, for an EHC needs assessment. Section F provision typically includes named SaLT input plus daily small-step practice. CAMHS may be involved where co-occurring generalised anxiety, separation anxiety, or autism is present.
Related terms
The terms parents most often see alongside Selective Mutism.
Anxiety Disorder
Persistent, intense worry or fear that interferes with daily life. In SEND, anxiety is often the driver of school avoidance, meltdowns, or shutdowns, and frequently the unmet need behind 'behaviour'.
Speech, Language and Communication Needs(SLCN)
An umbrella term for difficulties with understanding language, using language, speaking clearly, or interacting socially. SLCN is one of the four broad SEND areas in the Code of Practice.
Speech and Language Therapist(SLT)
An HCPC-registered specialist who assesses and treats children with speech, language, communication, and swallowing needs. SLTs contribute to EHCPs and deliver targeted therapy.
Where parents ask about this
Parents usually find this page after a school has misread silence as defiance, after a long wait for community SaLT or CAMHS, or after a transition (Reception to Year 1, primary to secondary) has caused regression. Searches include "selective mutism school strategies", "private SaLT for selective mutism", and "selective mutism EHCP". A Beaakon SaLT with selective mutism experience can carry out an assessment, deliver or train staff to deliver the sliding-in technique, and write a Section F-grade plan for the school to implement.
References
The primary legislation, statutory guidance, research, and clinical tools this page draws on.