what is world down syndrome day
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.