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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.
Down syndrome is an intellectual disability that about 5,000 babies in the United States are born with each year. A person with Down syndrome has 47 chromosomes, microscopic structures that carry genetic information to determine almost everything about a person. Most people have only 46 chromosomes.