World Down Syndrome Day

World Down Syndrome Day (WDSD) is marked each year on March 21,[1] beginning in 2007.

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.

A common activity is wearing colorful or mismatched socks, to show support for people with Down syndrome.

[4] An animated short, Freebird, was created to recognize World Down Syndrome Day in 2021.