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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 Was Not Discovered By Dr. Down. Down syndrome (DS) is a condition due to a chromosome abnormality. The chromosome abnormality leads to impairment of both the physical and intellectual development of the individual. In 1959, the late French physician Jerome Lejeune and coworkers reported finding an extra chromosome in each of nine children with DS.