# What is Down Syndrome, and what are its ICD-11 features in early childhood?

Canonical: https://pinnacleblooms.org/ask/what-is-down-syndrome-and-what-are-its-icd-11-features-in-early-childhood
Publisher: Pinnacle Blooms Network / Bharath Healthcare Laboratories Private Limited

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.

*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.*

## In short
Down 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.

## Clinical features in early childhood
**Recognisable at birth / infancy**
- Hypotonia, often with poor Moro and joint hyperflexibility
- Characteristic facies — flat nasal bridge, upslanting palpebral fissures, epicanthic folds, small ears, protruding tongue, brachycephaly
- Single transverse palmar crease, sandal-gap toe, short fifth-finger clinodactyly

**Course through early childhood**
- Global developmental delay — motor milestones and expressive language commonly most affected; receptive skills and social engagement relatively stronger
- Variable intellectual developmental disorder, typically mild–moderate
- High comorbidity warranting active surveillance: congenital heart disease (~40–50%), hearing loss (otitis-media-prone), visual refractive error, hypothyroidism, atlantoaxial instability and feeding difficulty

## The Pinnacle way
A 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).

## Trusted sources
WHO ICD-11 (LD40.0); CDC developmental milestones; Indian Academy of Pediatrics; American Academy of Pediatrics (HealthyChildren.org).

**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).

This is general information, not a diagnosis — individual assessment and diagnosis require an appropriately qualified healthcare professional.

## Sources
- WHO ICD-11 (LD40.0): https://icd.who.int/en
- CDC — Learn the Signs. Act Early.: https://www.cdc.gov/child-development
- American Academy of Pediatrics (HealthyChildren.org): https://www.healthychildren.org

## Connected topics and perspectives
- Conditions: https://pinnacleblooms.org/ask/conditions
- Doctor: https://pinnacleblooms.org/ask/lens/stakeholder/doctor
- Context: https://pinnacleblooms.org/ask/lens/domain/context
- Definition: https://pinnacleblooms.org/ask/lens/intent/definition
- Screen: https://pinnacleblooms.org/ask/lens/lifecycle/screen
- Special Education: https://pinnacleblooms.org/ask/lens/route/special-education
- Early Clarity: https://pinnacleblooms.org/ask/lens/empowerment/early_clarity

## Related question paths

### Understand the subject
- What is Down Syndrome?: https://pinnacleblooms.org/ask/what-is-down-syndrome
- ICD-11 Classification for Down Syndrome (LD40.0): https://pinnacleblooms.org/ask/what-is-the-icd-11-classification-for-down-syndrome
- Which ICF functioning domains does Down Syndrome affect in early childhood?: https://pinnacleblooms.org/ask/which-icf-functioning-domains-does-down-syndrome-affect-in-early-childhood
- What is the SNOMED CT concept for Down Syndrome?: https://pinnacleblooms.org/ask/what-is-the-snomed-ct-concept-for-down-syndrome
- How Down Syndrome Affects a Child's Daily Life: https://pinnacleblooms.org/ask/how-does-down-syndrome-affect-a-child-s-daily-life
- Is Down Syndrome Considered a Disability?: https://pinnacleblooms.org/ask/is-down-syndrome-considered-a-disability
- Is Down Syndrome Genetic or Hereditary?: https://pinnacleblooms.org/ask/is-down-syndrome-genetic-or-hereditary
- Common Myths About Down Syndrome: https://pinnacleblooms.org/ask/what-are-common-myths-about-down-syndrome
- Types of Down Syndrome: https://pinnacleblooms.org/ask/what-are-the-types-or-levels-of-down-syndrome
- What causes Down Syndrome in children?: https://pinnacleblooms.org/ask/what-causes-down-syndrome-in-children
- Early Intervention Outcomes for Down Syndrome Under 7: https://pinnacleblooms.org/ask/what-does-current-research-show-about-early-intervention-outcomes-for-down-syndrome-in-children-under-7
- Conditions That Often Occur With Down Syndrome: https://pinnacleblooms.org/ask/what-other-conditions-often-occur-alongside-down-syndrome

### Recognise signs & concerns
- Early Indicators of Down Syndrome for the Paediatrician: https://pinnacleblooms.org/ask/what-early-indicators-of-down-syndrome-should-a-paediatrician-watch-for
- Clinical Red Flags for Down Syndrome Warranting Referral: https://pinnacleblooms.org/ask/what-clinical-red-flags-for-down-syndrome-warrant-referral-in-a-young-child
- When should a doctor refer a child with suspected Down syndrome for developmental therapy?: https://pinnacleblooms.org/ask/when-should-a-doctor-refer-a-child-with-suspected-down-syndrome-for-developmental-therapy
- Can Down Syndrome Be Cured?: https://pinnacleblooms.org/ask/can-down-syndrome-be-cured
- Can Down Syndrome Be Prevented?: https://pinnacleblooms.org/ask/can-down-syndrome-be-prevented
- Do boys show Down syndrome differently?: https://pinnacleblooms.org/ask/do-boys-show-down-syndrome-differently
- Down Syndrome in Girls: https://pinnacleblooms.org/ask/do-girls-show-down-syndrome-differently
- How a frontline health worker can spot possible Down syndrome early: https://pinnacleblooms.org/ask/how-can-a-frontline-health-worker-spot-a-child-with-possible-down-syndrome-early
- What are the early signs of Down Syndrome?: https://pinnacleblooms.org/ask/what-are-the-early-signs-of-down-syndrome
- Early Signs of Down Syndrome in a 1-Year-Old Boy: https://pinnacleblooms.org/ask/what-are-the-early-signs-of-down-syndrome-in-a-1-year-old-boy
- Early Signs of Down Syndrome in a 1-Year-Old Girl: https://pinnacleblooms.org/ask/what-are-the-early-signs-of-down-syndrome-in-a-1-year-old-girl
- Early Signs of Down Syndrome at 12–18 Months: https://pinnacleblooms.org/ask/what-are-the-early-signs-of-down-syndrome-in-a-12-to-18-month-old

### Explore causes & influences
- Contributing Factors for Down Syndrome in Early Childhood: https://pinnacleblooms.org/ask/what-are-the-known-contributing-factors-for-down-syndrome-in-early-childhood
- Are boys more likely to have Down Syndrome?: https://pinnacleblooms.org/ask/are-boys-more-likely-to-have-down-syndrome
- Are girls more likely to have Down syndrome?: https://pinnacleblooms.org/ask/are-girls-more-likely-to-have-down-syndrome
- Early Intervention for Down Syndrome and the UNCRPD & SDGs: https://pinnacleblooms.org/ask/how-does-early-intervention-for-down-syndrome-advance-un-child-rights-uncrpd-and-the-sdgs
- What Causes Down Syndrome in Young Children?: https://pinnacleblooms.org/ask/what-causes-down-syndrome-in-young-children
- Cost-effectiveness of early therapy for Down syndrome in young children: https://pinnacleblooms.org/ask/what-is-the-cost-effectiveness-of-early-therapy-for-down-syndrome-in-young-children
- Down Syndrome in India: Prevalence and Public-Health Burden: https://pinnacleblooms.org/ask/what-is-the-prevalence-and-public-health-burden-of-down-syndrome-among-young-children-in-india

### Understand assessment
- How Down Syndrome Is Assessed in a Young Child: https://pinnacleblooms.org/ask/how-is-down-syndrome-assessed-in-a-young-child
- Recommended Screening & Diagnostic Pathway for Down Syndrome Under 7: https://pinnacleblooms.org/ask/what-is-the-recommended-screening-and-diagnostic-pathway-for-down-syndrome-in-children-under-7
- How does AbilityScore track progress in a child with Down Syndrome?: https://pinnacleblooms.org/ask/how-does-abilityscore-track-progress-in-a-child-with-down-syndrome
- AbilityScore 0–100 for Down Syndrome: https://pinnacleblooms.org/ask/what-does-an-abilityscore-of-0-100-mean-for-a-child-with-down-syndrome
- What does an AbilityScore of 100–200 mean for a child with Down Syndrome?: https://pinnacleblooms.org/ask/what-does-an-abilityscore-of-100-200-mean-for-a-child-with-down-syndrome
- What does an AbilityScore of 200–300 mean for a child with Down Syndrome?: https://pinnacleblooms.org/ask/what-does-an-abilityscore-of-200-300-mean-for-a-child-with-down-syndrome
- What does an AbilityScore of 300–400 mean for a child with Down Syndrome?: https://pinnacleblooms.org/ask/what-does-an-abilityscore-of-300-400-mean-for-a-child-with-down-syndrome
- What an AbilityScore of 400–500 Means for a Child with Down Syndrome: https://pinnacleblooms.org/ask/what-does-an-abilityscore-of-400-500-mean-for-a-child-with-down-syndrome
- What does an AbilityScore of 500–600 mean for a child with Down Syndrome?: https://pinnacleblooms.org/ask/what-does-an-abilityscore-of-500-600-mean-for-a-child-with-down-syndrome
- What an AbilityScore® of 600–700 Means for a Child with Down Syndrome: https://pinnacleblooms.org/ask/what-does-an-abilityscore-of-600-700-mean-for-a-child-with-down-syndrome
- AbilityScore 700–800 for a Child with Down Syndrome: https://pinnacleblooms.org/ask/what-does-an-abilityscore-of-700-800-mean-for-a-child-with-down-syndrome
- AbilityScore 800–900 for a Child with Down Syndrome: https://pinnacleblooms.org/ask/what-does-an-abilityscore-of-800-900-mean-for-a-child-with-down-syndrome

### Explore therapy & support
- As a grandparent or caregiver, how can I support a child with Down Syndrome day to day?: https://pinnacleblooms.org/ask/as-a-grandparent-or-caregiver-how-can-i-support-a-child-with-down-syndrome-day-to-day
- Can a Child with Down Syndrome Attend a Mainstream School?: https://pinnacleblooms.org/ask/can-a-child-with-down-syndrome-attend-a-mainstream-school
- Can a Child with Down Syndrome Attend a Regular School?: https://pinnacleblooms.org/ask/can-a-child-with-down-syndrome-attend-a-regular-school
- Can a Child with Down Syndrome Grow Up to Live Independently?: https://pinnacleblooms.org/ask/can-a-child-with-down-syndrome-grow-up-to-live-independently
- How can a classroom teacher help a child with Down Syndrome take part and learn?: https://pinnacleblooms.org/ask/how-can-a-classroom-teacher-help-a-child-with-down-syndrome-take-part-and-learn
- How can a district early intervention programme identify and support children under 7 with Down Syndrome?: https://pinnacleblooms.org/ask/how-can-a-district-early-intervention-programme-identify-and-support-children-under-7-with-down-syndrome
- How a teacher can include a child with Down syndrome: https://pinnacleblooms.org/ask/how-can-a-teacher-include-and-support-a-young-child-with-down-syndrome-in-a-mainstream-classroom
- How does therapy help a child with Down Syndrome make progress?: https://pinnacleblooms.org/ask/how-does-therapy-help-a-child-with-down-syndrome-make-progress
- How is Down syndrome diagnosed in a child?: https://pinnacleblooms.org/ask/how-is-down-syndrome-diagnosed-in-a-child
- How is Down Syndrome supported through therapy?: https://pinnacleblooms.org/ask/how-is-down-syndrome-supported-through-therapy
- Down Syndrome AbilityScore: Your Next Steps: https://pinnacleblooms.org/ask/my-child-with-down-syndrome-has-an-abilityscore-of-0-100-what-should-we-do-next
- Down Syndrome AbilityScore 100–200 — what to do next: https://pinnacleblooms.org/ask/my-child-with-down-syndrome-has-an-abilityscore-of-100-200-what-should-we-do-next