The American Association for Klinefelter Syndrome Information and Support (AAKSIS) is a national volunteer association with the mission of education, support, research, and understanding of 47 XXY and its variants, collectively known as Klinefelter syndrome.

This is a nonprofit education and support organization for Klinefelter syndrome and its variants.

The March of Dimes tries to improve the health of babies by preventing birth defects, premature birth, and early death. March of Dimes supports research, community services, education, and advocacy to save babies' lives. The organization's Web site has information on premature birth, birth defects, birth defects testing, pregnancy, and prenatal care. You can sign up to get a free newsletter and also explore Understanding Your Newborn: An Interactive Program for New Parents.

The National Dissemination Center for Children with Disabilities (NICHCY) is the national information and referral center that provides information on disabilities and disability-related issues for families, educators, and other professionals. The focus is on children and youth, birth to age 22.