American Academy of Pediatrics: Genetics and Birth Defects
www.healthychildren.org/English/health-issues/conditions/developmental-disabilities/pages/Congenital-Abnormalities.aspx
Centers for Disease Control and Prevention: Pediatric Genetics
www.cdc.gov/ncbddd/pediatricgenetics
March of Dimes: Birth Defects
www.marchofdimes.com/baby/birthdefects_chromosomal.html
National Institute of Child Health & Human Development: Birth Defects
www.nichd.nih.gov/health/topics/birthdefects