Down Syndrome
Down Syndrome: ICD-11 Features in Early Childhood
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, our early intervention programme, and how the AbilityScore® is formed.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.
This is general information, not a diagnosis — a clinical AbilityScore® and any diagnosis are formed only at a Pinnacle Blooms Network centre under qualified clinician care.
What to watch
Hypotonia, characteristic facies and global developmental delay, with active surveillance for congenital heart disease, hearing loss, hypothyroidism, visual error and atlantoaxial instability.
Try this at home
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.
Trusted sources
Developed by SETU Consortium · Pinnacle Blooms Network · Last reviewed 2026-06-10
This is general information, not a diagnosis. A clinical AbilityScore® and any diagnosis are formed only at a Pinnacle Blooms Network centre, under qualified clinician care.
Frequently asked
What is the ICD-11 code for Down syndrome?
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.
Is Down syndrome diagnosed at birth?
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.
What comorbidities need surveillance in early childhood?
Active surveillance is warranted for congenital heart disease, hearing loss, visual refractive error, hypothyroidism, atlantoaxial instability and feeding difficulty, alongside developmental monitoring.