{"h1":"Down Syndrome: ICD-11 Features in Early Childhood","faq":[{"a":"Down syndrome is coded as LD40.0 in the ICD-11-MMS, within the chapter for developmental anomalies and chromosomal disorders. It corresponds to trisomy 21, the most common chromosomal cause of intellectual developmental disorder.","q":"What is the ICD-11 code for Down syndrome?"},{"a":"It is usually recognised clinically at or near birth from characteristic features and hypotonia, and confirmed by karyotyping. Prenatal screening and diagnostic testing can also identify it antenatally.","q":"Is Down syndrome diagnosed at birth?"},{"a":"Active surveillance is warranted for congenital heart disease, hearing loss, visual refractive error, hypothyroidism, atlantoaxial instability and feeding difficulty, alongside developmental monitoring.","q":"What comorbidities need surveillance in early childhood?"}],"lang":"en","slug":"what-is-down-syndrome-and-what-are-its-icd-11-features-in-early-childhood","title":"What is Down Syndrome, and what are its ICD-11 features in early childhood?","entity":{"key":"down-syndrome","kind":"condition","name":"Down Syndrome","slug":"down-syndrome"},"lenses":[{"kind":"stakeholder","label":"Doctor","value":"doctor"},{"kind":"domain","label":"Context","value":"context"},{"kind":"intent","label":"Definition","value":"definition"},{"kind":"lifecycle","label":"Screen","value":"screen"},{"kind":"route","label":"Special-Education","value":"special-education"},{"kind":"empowerment","label":"Early Clarity","value":"early_clarity"}],"parent":{"key":"conditions","label":"Conditions"},"related":[{"lang":"en","slug":"what-is-the-icd-11-classification-for-down-syndrome","title":"ICD-11 Classification for Down Syndrome (LD40.0)"},{"lang":"en","slug":"what-early-indicators-of-down-syndrome-should-a-paediatrician-watch-for","title":"Early Indicators of Down Syndrome for the Paediatrician"},{"lang":"en","slug":"how-is-down-syndrome-assessed-in-a-young-child","title":"How Down Syndrome Is Assessed in a Young Child"},{"lang":"en","slug":"what-is-down-syndrome","title":"What is Down Syndrome?"},{"lang":"en","slug":"which-icf-functioning-domains-does-down-syndrome-affect-in-early-childhood","title":"Which ICF functioning domains does Down Syndrome affect in early childhood?"},{"lang":"en","slug":"what-are-the-known-contributing-factors-for-down-syndrome-in-early-childhood","title":"Contributing Factors for Down Syndrome in Early Childhood"}],"summary":"Down syndrome (trisomy 21, ICD-11 LD40.0) is the most common chromosomal cause of intellectual developmental disorder. In early childhood it presents with neonatal hypotonia, characteristic facies, global developmental delay and high-comorbidity surveillance needs (cardiac, hearing, thyroid, visual, atlantoaxial). Diagnosis and AbilityScore® are formed only at a Pinnacle centre.","answer_md":"*A young child with Down syndrome arrives not as a syndrome but as a child with a clear, recognisable developmental profile — and the earliest, surest start in life.*\n\n## In short\nDown syndrome (trisomy 21) is a genetic condition arising from a full or partial extra copy of chromosome 21, classified in **ICD-11 as LD40.0** under disorders with disordered genomic imprinting/chromosomal anomalies. It is typically recognised at or near birth and is characterised by a consistent constellation of dysmorphic features, generalised hypotonia, and a spectrum of intellectual developmental disorder. It is the most common chromosomal cause of intellectual disability worldwide.\n\n## Clinical features in early childhood\n**Recognisable at birth / infancy**\n- Hypotonia, often with poor Moro and joint hyperflexibility\n- Characteristic facies — flat nasal bridge, upslanting palpebral fissures, epicanthic folds, small ears, protruding tongue, brachycephaly\n- Single transverse palmar crease, sandal-gap toe, short fifth-finger clinodactyly\n\n**Course through early childhood**\n- Global developmental delay — motor milestones and expressive language commonly most affected; receptive skills and social engagement relatively stronger\n- Variable intellectual developmental disorder, typically mild–moderate\n- High comorbidity warranting active surveillance: congenital heart disease (~40–50%), hearing loss (otitis-media-prone), visual refractive error, hypothyroidism, atlantoaxial instability and feeding difficulty\n\n## The Pinnacle way\nA clinical **AbilityScore®** and any diagnosis are established only at a Pinnacle Blooms Network centre, under qualified clinician care — never from an online tool. Early, structured input shapes outcomes profoundly. Explore the [Down syndrome pathway](/down-syndrome), our [early intervention programme](/early-intervention), and [how the AbilityScore® is formed](/ask/what-is-the-abilityscore-and-how-is-it-calculated).\n\n## Trusted sources\nWHO ICD-11 (LD40.0); CDC developmental milestones; Indian Academy of Pediatrics; American Academy of Pediatrics (HealthyChildren.org).\n\n**Next step —** Refer early: a Pinnacle clinician can establish a developmental baseline and coordinate the multidisciplinary surveillance these children need. [Begin a clinical referral](/early-intervention).\n\nThis is general information, not a diagnosis — individual assessment and diagnosis require an appropriately qualified healthcare professional.","canonical":"https://pinnacleblooms.org/ask/what-is-down-syndrome-and-what-are-its-icd-11-features-in-early-childhood","editorial":{"reviewed_at":"2026-06-11T20:12:18.613642+00:00","reviewed_by":null,"developed_by":"SETU Consortium · Pinnacle Blooms Network"},"alternates":[{"href":"https://pinnacleblooms.org/ask/what-is-down-syndrome-and-what-are-its-icd-11-features-in-early-childhood","lang":"en","indexable":true},{"href":"https://pinnacleblooms.org/ask/what-is-down-syndrome-and-what-are-its-icd-11-features-in-early-childhood-te","lang":"te","indexable":true}],"dimensions":[{"key":"conditions","label":"Conditions"}],"meta_title":"Down Syndrome (ICD-11 LD40.0): Early Features","meta_robots":"index, follow, max-image-preview:large","everyday_tip":"At every well-child visit, pair the standard milestone check with condition-specific surveillance — hearing, thyroid and cardiac review — rather than attributing every delay to the diagnosis alone.","published_at":"2026-06-10T10:42:00.172548+00:00","reading_paths":[{"key":"understand","items":[{"lang":"en","slug":"what-is-down-syndrome","title":"What is Down Syndrome?","reason":"Linked from this answer"},{"lang":"en","slug":"what-is-the-icd-11-classification-for-down-syndrome","title":"ICD-11 Classification for Down Syndrome (LD40.0)","reason":"Linked from this answer"},{"lang":"en","slug":"which-icf-functioning-domains-does-down-syndrome-affect-in-early-childhood","title":"Which ICF functioning domains does Down Syndrome affect in early childhood?","reason":"Linked from this answer"},{"lang":"en","slug":"what-is-the-snomed-ct-concept-for-down-syndrome","title":"What is the SNOMED CT concept for Down Syndrome?","reason":"Same topic"},{"lang":"en","slug":"how-does-down-syndrome-affect-a-child-s-daily-life","title":"How Down 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Act Early."},{"url":"https://www.healthychildren.org","label":"American Academy of Pediatrics (HealthyChildren.org)"}],"last_reviewed_at":"2026-06-10T10:42:00.172548+00:00","meta_description":"Down syndrome (trisomy 21, ICD-11 LD40.0): definition and key early-childhood clinical features — hypotonia, facies, developmental delay and comorbidities.","related_materials":[],"related_techniques":[]}