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Down syndrome

Medical Conditions

Down syndrome is the most common birth defect, caused by 3 copies (trisomy) of Chromosome 21. Children with Down syndrome have a flattened nose and eyes that slant upward. They have short, broad fingers and may have a single crease in the palm. Most children with Down syndrome are developmentally delayed and don't reach average adult height. Many have heart defects and problems with the digestive tract.

This section includes information on Down syndrome and:

  • adolescence
  • autism
  • breastfeeding a baby with Down syndrome
  • diabetes
  • digestive disorders
  • seizures
  • speech
  • toilet training
  • sexuality

More information

Down syndrome Fact Sheet – Phoenix Children’s Hospital

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