World Down Syndrome Day is on 21st March every year. It is a global awareness day which has been officially observed by the United Nations since 2012. The goal is to help people understand and support those with Down syndrome better.

The date being the 21st day of the 3rd month was chosen to represent the triplication (trisomy) of the 21st chromosome which causes Down syndrome.

2025 Theme

The theme is the message that we are asking supporters to share on and around World Down Syndrome Day, 21 March 2025. We call on all Governments to Improve Our Support Systems.

Everyone needs support sometimes.

People with Down syndrome need support to live and be included in the community, like everyone else.Families also need support, as they are often supporting their family member with Down syndrome.Support is a key human right that helps make other rights possible.The support that we need is different for each person.

To learn more, please click here.