Down syndrome is a genetic condition. It is not an illness or a disease. People with Down syndrome have 47 chromosomes in their cells instead of 46. They have an extra chromosome 21, which is why Down syndrome is also sometimes known as trisomy 21.
Organisations that can offer more information:
Down Syndrome Australia
Down Syndrome Australia is the peak body for people with Down syndrome in Australia. Its purpose is to influence social and policy change, provide a national profile and voice for people living with Down syndrome. Down Syndrome Australia works collaboratively with the eight state and territory Down syndrome associations to achieve their mission. Its vision is an Australia where people living with Down syndrome are valued, reach their potential and enjoy social and economic inclusion.