The greatest risk factor in is increased maternal age, the majority of children with Down syndrome are born to mothers under the age of 35, because the vast majority of children as a whole are born to younger mothers.
== Treatment ==
On July 13, 2013, researchers at University of Massachusetts--Worcester took cells from Down syndrome people and were able to turn off the extra chromosomes that cause the disorder, though available treatment is still a long way from now. <ref>https://www.theguardian.com/science/2013/jul/17/downs-syndrome-cells-fixed-chromosome-therapy</ref>
==References==