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Organizations and Resources in the United States

• Mothers of Supertwins (MOST) is a support network of families with triplets and more. MOST provides information, resources, empathy and good humor during pregnancy, infancy, toddlerhood and school age.
• National Organization of Mothers of Twins Clubs is a network of 475 local clubs representing over 21,000 individual parents of multiples -- twins, triplets and quadruplets.
• Sidelines is a network of support groups across the country for women with complicated pregnancies and their families.
• The Triplet Connection is a "Network of Caring and Sharing" for multiple-birth families that provides information to families who are expecting triplets, quadruplets, quintuplets or more, as well as encouragement, resources, and networking opportunities for families who are parents of larger multiples.
• Twin to Twin Transfusion Syndrome Foundation is dedicated to providing educational, emotional and financial support to families and caregivers before, during, and after pregnancies diagnosed with twin to twin transfusion syndrome.
• American Society for Reproductive Medicine is an organization devoted to advancing knowledge and expertise in infertility, reproductive medicine and biology. This link offers a Patient Fact Sheet on the Challenges of Parenting Multiples.
• The American Fertility Association is a national non-profit organization dedicated to assisting women and men facing decisions related to family building and reproductive health - from prevention and treatment of infertility to social and psychological concerns.

International Organizations

• Australian Multiple Birth Association is an organization for multiple birth families of Australia, to provide information and support and to increase awareness of the special needs of multiple birth families.
• Multiple Births Canada/Naissances Multiples Canada (formerly POMBA) -  an organization to improve the quality of life for multiple birth individuals and their families in Canada.
• Higher Order Multiples Support Network is part of Multiple Births Canada and provides support services to experienced, new and expectant families of triplets, quadruplets, quintuplets and more.
• TAMBA - Twins and Multiple Birth Association is a registered charity in the United Kingdom for all parents with twins, triplets, quads, quints, sextuplets or more - to help them meet the challenge of their unique experience! 
• Two, Four, Six, Eight - Educating Twins, Triplets and More is an Australian site that provides information, new knowledge and downloadable materials with regard to the educational needs of multiple birth children.
• Australian Twin to Twin Transfusion Syndrome Awareness is an information, research and support site for those diagnosed with Twin to Twin Transfusion Syndrome.
• Multifamilias Multifamilias nació de la necesidad de varias familias con mellizos, trillizos y más de compartir sus experiencias, sus ideas, su información y esta inmensa alegría de tener hijos múltiples, con otras familias en la misma situación.
• FAPAMU, Federación de Asociaciones de partos múltiples Un punto de encuentro iniciado en el año 1999, para familias de múltiples de habla hispana, que deseen encontrar información, compartir sus experiencias, contactar con personas en su misma situación... y mucho más.