Nonprofit organization for medical and social research on multiple births. Offers articles and statistics on multiple births and information on festivals around the world.

Resources and research on multiple births. Offers information on events and community forum.

Nonprofit organization in the UK providing information on multiple births for professionals and families. Offers details of prenatal classes and social events.

Information about the organization, membership, local clubs, research, and news.

Information loss in multiple birth for parents, survivors, relatives and professionals. Also available in Spanish, French, Chinese and Russian.

Magazine for parents of multiples with fun facts, humor, resources for parents, and subscription information.

Support network for parents of triplets or more. Includes information about the organization, resources, membership, and contact details.

Offers free Web sites for twins, a message board, shop, database, auctions and news and events.