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Down syndrome is a genetic disorder caused when abnormal cell division results in an extra full or partial copy of chromosome 21.

Each person with Down syndrome is an individual — intellectual and developmental problems may be mild, moderate or severe.

Small head Short neck Protruding tongue Upward slanting eye lids (palpebral fissures) Unusually shaped or small ears Poor muscle tone Broad, short hands with a single crease in the palm Relatively short fingers and small hands and feet Excessive flexibility Tiny white spots on the colored part (iris) of the eye called Brushfield's spots Short height