The following links enable you to access useful information regarding chromosomal abnormalities and genetic birth defects. The list also contains links to appropriate support groups, parent organizations and government entities.
Association for Retarded Citizens
Chromosome 18 Registry and Research Society
National Down Syndrome Society
Genetic Alliance
http://www.geneticalliance.org
March of Dimes
SOFT (Support for Trisomy 13/18)
National Organization for Rare Disorders
National Institutes for Health
U.S. Department of Health & Human Services