General
- Alliance of Genetic Support Groups
- Centers for Disease Control and Prevention (CDC)
- Congenital Malformations Browser
- Gene Reviews
- Global Birth Defects
- IBIS: International Birth Defects Information systems
- March of Dimes
- National Institutes of Health – Genetic and Rare Diseases Information Center
- National Organization for Rare Disorders
- Online Mendelian Inheritance in Man (OMIM)
- Orphanet
- World Health Organization (WHO)