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A mother holds her daughter in her arms. Her daughter has an extra chromosome. Her daughter is happy and smiling

World Down Syndrome Day

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In December 2011, the General Assembly declared 21 March as World Down Syndrome Day

World Down Syndrome Day (WDSD) , 21 March, is a global awareness day which has been officially observed by the United Nations since 2012.
The date for WDSD being the 21st day of the 3rd month, was selected to signify the uniqueness of the triplication (trisomy) of the 21st chromosome which causes Down syndrome.
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