The World Down Syndrome Day (WDSD) is observed every year on March 21 across the world. It is a day aimed to spread awareness about Down Syndrome and has been officially observed by the United Nations since 2012. 

The 21st day of March was specifically chosen to commemorate WDSD to portray the uniqueness of the triplication or trisomy of the 21st chromosome which causes Down Syndrome. The disorder causes developmental and intellectual delays. 

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History behind the day:

Brazilian Federation of Associations of Down Syndrome campaigned extensively with Down Syndrome International to gather international support. After which, Brazil and Poland's joint work led to adoption of resolution by consensus during UN General Assembly meeting in 2011. 

The resolution was later co-sponsored by 78 UN member states. On December 19, 2011, the United Nations General Assembly declared March 21 as World Down Syndrome Day. 

Theme: 

The theme of the day for 2021 is "We Decide." It means that people who have down syndrome should have full independence in matters related to them and that they can make their own decisions about their lives.

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Significance:

The day's main aim is to showcase the abilities and achievements of people with down syndrome. It also focuses on encouraging independence and freedom of choice for people with down syndrome.

What is Down Syndrome?

It is a genetic disorder in which there is an additional 21st chromosome. Commonly people have 46 chromosomes in all cells but people with down syndrome have 47 chromosomes because of which they look and learn differently.

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Few symptoms of down syndrome include cognitive deficiency level in a person, decreased muscle tone, short and a flattened tip of nose, muscle weakness and flexible joint beyond normal.