Definition
Down's Syndrome is a genetic condition caused by an extra full or partial copy of chromosome 21, producing a recognisable pattern of physical features, a variable degree of learning disability, and an increased risk of cardiac, thyroid, hearing, and sleep difficulties. It is the most common genetic cause of learning disability in the UK, affecting around 1 in 700 live births.
In context for parents
Key checkpoints
- Down's Syndrome is caused by an extra full or partial copy of chromosome 21; the most common genetic cause of learning disability in the UK (around 1 in 700 births).
- DSMIG-UK paediatric medical surveillance checklist sets the schedule for cardiac, thyroid, hearing, vision, and sleep reviews.
- The Down Syndrome Act 2022 places a duty on relevant authorities (including NHS and LAs) to have regard to specific guidance.
- Profile is wide: some children read fluently by Year 2, others work at the early stages of phonics in Year 6.
- Almost every UK child with Down's Syndrome has, or is entitled to, an EHCP.
Around 95% of Down's Syndrome is non-disjunction trisomy 21; 4% is translocation; 1% is mosaic. The diagnosis is usually made antenatally or at birth via karyotype, and is followed by a programme of medical reviews. The Down Syndrome Medical Interest Group (DSMIG-UK) checklist sets out the surveillance schedule for cardiac, thyroid, hearing, vision, sleep apnoea, atlanto-axial instability, and coeliac. NICE NG241 (2024) covers care of adults with Down's Syndrome but the DSMIG paediatric schedule remains the primary UK protocol.
In school, the picture is wide. Some children with Down's Syndrome read fluently by Year 2; some are working at the early stages of phonics in Year 6. Most have stronger receptive than expressive language and benefit hugely from a sign-supported approach (Makaton is widely used in UK Reception classrooms with Down's Syndrome learners). Verbal working memory is typically a relative weakness; visual learning is a strength. The DownsEd / Down Syndrome International "See and Learn" reading-led literacy programme has the strongest evidence base in the UK.
Almost every UK child with Down's Syndrome has, or is entitled to, an EHCP. The Down's Syndrome Act 2022 places a duty on relevant authorities (including NHS and local authorities) to have regard to specific guidance about meeting the needs of people with Down's Syndrome. Section F provision typically quantifies SaLT, sometimes OT and physio, plus specific literacy programmes. Section I is often a mainstream school with Down's Syndrome inclusion experience, sometimes a specialist provision depending on the child's profile.
Related terms
The terms parents most often see alongside Down's Syndrome.
Moderate Learning Difficulty(MLD)
A general learning difficulty causing children to attain significantly below age-expected levels in most areas of the curriculum, despite appropriate teaching.
Severe Learning Difficulty(SLD)
A significant intellectual or cognitive impairment that has a major effect on a child's ability to take part in the curriculum. Most children with SLD need a highly differentiated specialist setting.
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.
Education, Health and Care Plan(EHCP)
A legally binding document, issued by a local authority in England, that describes a child or young person's special educational needs and the provision the LA must arrange to meet them.
Where parents ask about this
Parents usually find this page during transition to school, before an annual review where mainstream placement is being questioned, or before secondary school where parents want a specific inclusion-strong setting named in Section I. Searches include "Down's Syndrome mainstream secondary school", "Down's Syndrome Section F SaLT", and "Down's Syndrome Act 2022 guidance". A Beaakon SaLT, EP, or specialist teacher can carry out a profile that matches the child to the right provision and write Section F to a standard that the LA will not strip back at amendment.
References
The primary legislation, statutory guidance, research, and clinical tools this page draws on.