World Down Syndrome Day

World Down Syndrome Day (WDSD) is marked each year on March 21. The 21st day of March (the 3rd month of the year) was selected to signify the uniqueness of the triplication (trisomy) of the 21st chromosome which causes Down syndrome. The General Assembly of the United Nations has decided to observe it each year since 2012.

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World Down Syndrome Day

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