The World Down Syndrome Day is held every March 21, and it is a global awareness day which has been officially observed by the United Nations since 2012.
The UN declared March 21, as World Down Syndrome Day in order to raise public awareness of this syndrome.
Some relevant organizations such as the United Nations system and other international organizations of public and private sector were invited to observe the WDSD in an appropriate manner.
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As a reminder, Down syndrome occurs when an individual has an extra partial (or whole) copy of chromosome 21. It has not been known yet why this syndrome occurs, but it has always been a part of human condition.