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''Quadruplet, quintuplet, etc. redirect here. For the musical use of the terms, see tuplet.

A multiple birth occurs where more than one fetus exits the womb in a single pregnancy. Different names for multiple birth are used, depending on the actual multiple. Common multiples are two and three, known as twins and triplets respectively. Twins, triplets and other multiple births occur to varying degrees in most animal species, although the term is most applicable to species in placental species.

There are two types of multiple births, fraternal (dizygotic) and identical (monozygotic). Identical siblings arise where one egg is fertilised and the resulting zygote splits into more than one embryo. Identical siblings therefore have the same genetic material. Fraternal siblings result from the fertilisation and implantation of more than one egg, so fraternal siblings are not genetically identical.

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How do multiple births occur? http://bit.ly/wWXUz #infertility #ivf
DeccanIVF (Deccan IVF) Thu, 05 Nov 2009 05:27:30 -0000
How do multiple births occur? http://bit.ly/wWXUz #infertility #ivf
.@marygazze and oh yes, the high cost of premmies & sick babies born in multiple births created by fertility drugs, it gets ridiculous
TariAkpodiete (TariAkpodiete) Wed, 04 Nov 2009 06:40:08 -0000
.@marygazze and oh yes, the high cost of premmies & sick babies born in multiple births created by fertility drugs, it gets ridiculous
@TariAkpodiete report said if gov funded it, it would actually be cheaper than covering premature births of multiple babies born @ same time
marygazze (Mary Gazze) Wed, 04 Nov 2009 06:38:59 -0000
@TariAkpodiete report said if gov funded it, it would actually be cheaper than covering premature births of multiple babies born @ same time
@bob_ij awwwwwwww i want 3girls! and there are no multiple births in my family!;o(
Tinuo (Tinu) Tue, 03 Nov 2009 23:23:58 -0000
@bob_ij awwwwwwww i want 3girls! and there are no multiple births in my family!;o(
@EvilGayTwin they send a bad message about multiple births everywhere
travelling_wolf (Péter) Sun, 01 Nov 2009 20:00:46 -0000
@EvilGayTwin they send a bad message about multiple births everywhere
All the more reason I'm scared to have kids; my mom's a twin, younger siblings are twins, & so many other multiple births in my fam. Smh
honeytheMUA (Honey) Sun, 01 Nov 2009 13:30:47 -0000
All the more reason I'm scared to have kids; my mom's a twin, younger siblings are twins, & so many other multiple births in my fam. Smh

 
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TwinStuff.com - Bulletin boards, twin games, photo gallery, information for parents, TV and movie twins, twin events, and information.
Meta Description: [ twinstuff.com. Your Source for Information on Twins and Other Multiples on the Web ]

Twinsworld - Offerings include a twin casting agency, twin events, reunion of twins placed for adoption or separated at birth, message boards, links, photos, contests, and research.
Meta Description: [ twinsworld.com. The Ultimate Site and Resource For Twins, Triplets and Multiples on the Web ]

Facts About Multiples - Information on twins, triplets, quadruplets, quintuplets and higher order multiples. Features a database of multiple birth families, statistics, basic information on twinning, world records and information on fakers.
Meta Description: [ An online encyclopedia of multiple births, including twins, triplets, quadruplets, quintuplets, sextuplets, septuplets, octuplets and higher, including a message board, basic twinning info, statistics on fertility drugs and more. ]

The International Twins Association - A non-profit, family-oriented organization to promote the spiritual, intellectual, and social welfare of twins and multiples throughout the world.

Twin Connections - Twin Connections celebrates the unique and mysterious bond between twins by providing a place for twins, and their families and friends, to share and read twin stories and photos, learn interesting twin facts and news and join an online twin community.
Meta Description: [ If you're a twin, the parent of twins, or have relatives or friends that are twins, you've probably experienced or heard about the amazing connection twins have. This web site celebrates the special and often mysterious bond that connects twins. ]

404 TwinMajority.org - From 2127, most babies will be twins. This site explains why evolution predicts this.
Meta Description: [ From 2127, most babies will be twins. ]

Twins by Twins - This site is built for all those that want to learn more about twins and is dedicated to those that are twins and proud of it.

Twins Network - A resource for understanding twins and sharing information. Surveys, facts, news, trivia, links.
Meta Description: [ Twins Network: connecting twins around the world, Los Angeles Times article on Twins Network, A website resource for understanding twins and sharing information, connecting twins around the world. ]

TwinsRealm.com - Mirror twins from Australia share photos, twin stories, links and information on twin festivals and celebrations.

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