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World Down Syndrome Day (WDSD) is observed around the world every year on March 21st (3/21), in recognition of the 3 copies of chromosome 21 that is present in most people living with Down syndrome.own syndrome occurs when a person lucks out and gets 3 copies of the 21st chromosome instead of the standard pair. World Down Syndrome Day is today, 3/21, to acknowledge that fact and bring awareness.
The genetic basis of Down syndrome. Down syndrome is a genetic disorder caused when abnormal cell division results in extra genetic material from chromosome 21. This genetic disorder, which varies in severity, causes lifelong intellectual disability and developmental delays, and in some people it causes health problems. Down syndrome is the most common genetic chromosomal disorder and cause of learning disabilities in children. Better understanding of Down syndrome and early interventions can greatly increase the quality of life for children and adults with this disorder and help them live fulfilling lives.