National Down Syndrome Society
 The mission of the National Down Syndrome Society is to be the national advocate for the value, acceptance and inclusion of people with Down syndrome.
 http://www.ndss.org
International Down Syndrome Coalition
 Mission: to serve individuals with Down syndrome from conception throughout their lives.
 http://www.theidsc.org/
 
Brighter Tomorrows
 http://brightertomorrows.org/index.html
Down Syndrome Pregnancy, Inc.
 http://downsyndromepregnancy.org/
International Mosaic Down Syndrome Association
 http://www.imdsa.org/
National Association for Down Syndrome
 http://www.nads.org/
National Down Syndrome Congress
 http://www.ndsccenter.org/
March of Dimes
 http://www.marchofdimes.com/baby/birthdefects_chromosomal.html
SOFT (Support for Trisomy 13/18)
 Mission: to provide support and understanding to families involved in the issues and decisions surrounding the diagnosis and care in trisomies 18 and 13 and related chromosomal disorders.
 http://www.trisomy.org/
Trisomy 18 Foundation
 Mission: to encourage the search for treatments and prevention of trisomy 18, to educate and support medical professionals, and to create a caring worldwide community for affected families.
 http://www.trisomy18.org
Chromosome 18 Registry and Research Society
 www.chromosome18.org
SOFT (Support for Trisomy 13/18)
 www.trisomy.org
Trisomy 18 Foundation
 www.trisomy18.org
Read more about NIPT and the NHS RAPID study
 http://www.rapid.nhs.uk
ARC (Antenatal Results and Choices)
 Charity providing non-directive, individualised information and support to parents and professionals through antenatal screening, diagnosis and its consequences.
 www.arc-uk.org
1p36 Deletion Support and Awareness
 Mission: Support, Awareness and Education to improve the lives of individuals affected by 1p36 deletion syndrome.
 http://www.1p36dsa.org
Cri-du-Chat Support Group of Australia
 Mission: Information, Friendship and Support for those affected by Cri-du-Chat
 http://www.criduchat.asn.au/content/cri-du-chat-syndrome
ARC (Antenatal Results and Choices)
 Charity providing non-directive, individualised information and support to parents and professionals through antenatal screening, diagnosis and its consequences.
 www.arc-uk.org
Klinefelter Syndrome Information and Support
 Information and Advice
 http://www.klinefeltersyndrome.org
Turner Syndrome Support Society
 http://tss.org.uk
The Turner Syndrome Society of the United States
 turnersyndrome.org
AXYS
 genetic.org
The Focus Foundation
 thefocusfoundation.org
ARC (Antenatal Results and Choices)
 Charity providing non-directive, individualised information and support to parents and professionals through antenatal screening, diagnosis and its consequences.
 www.arc-uk.org