Here are some useful links that give some more information about Down Syndrome:
T21RS Trisomy 21 Research Society
Trisomy 21 Research Society is the first non-profit scientific organisation of researchers studying Down syndrome.
DSA Down Syndrome Association
Registered Charity providing information on Down Syndrome
UK registered charity improving the lives of those with Down Syndrome
The Consortium is a large, multidisciplinary team of clinicians, human geneticists, developmental psychologists, mouse geneticists, psychiatrists and cellular scientists, funded by the Wellcome Trust.
GDS Global Down Syndrome Foundation
The Global Down Syndrome Foundation is a public non-profit dedicated to significantly improving the lives of people with Down syndrome through Research, Medical Care, Education and Advocacy.
The mission of LuMind IDSC is to stimulate biomedical research that will accelerate the development of treatments to significantly improve the life and wellbeing of those living with Down Syndrome.