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World Down Syndrome Day

March 21, 2024

March 21 is World Down Syndrome Day, an occasion for awareness that has been formally observed by the United Nations since 2012. The 2024 theme is "End the Stereotypes" about people with the neurodiverse condition.

Model with Down syndrome holds Barbie depicting typical Down syndrome traits
Image: Catherine Harbour/Mattel/PA Media/dpa/picture alliance

About one in 800 babies are born with Down syndrome, or Trisomy 21, a condition that means they have an extra chromosome, which often causes various intellectual and physical disabilities, as well as other medical issues. March 21, or the 21st day of the third month of the year, was selected as the date of World Down Syndrome Day to signify the trisomy, or tripling, of the 21st chromosome.

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