World Down Syndrome Day
MARCH 18, 2026—World Down Syndrome Day (WDSD), held on March 21st every year, is a global awareness day that has been officially observed by the United Nations since 2012. The date for WDSD of 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.
