Editing Multiple birth (section)

===Triplets===
{{Redirect|Triplets||Triplet (disambiguation){{!}}Triplet}}
{{further|List of triplets}}
[[File:TripletsGirls.jpg|thumb|upright=1.2|Identical triplets like these three sisters occur when a single fertilized egg splits in two and then one of the resulting two zygotes splits again.]]
[[File:UOTW 19 - Ultrasound of the Week 1.webm|thumb|Monoamniotic triplets as seen on ultrasound<ref>{{Cite web |date=23 September 2014 |title=UOTW #19 - Ultrasound of the Week |url=https://www.ultrasoundoftheweek.com/uotw-19/ |url-status=live |archive-url=https://web.archive.org/web/20170509073218/https://www.ultrasoundoftheweek.com/uotw-19/ |archive-date=9 May 2017 |access-date=27 May 2017 |website=Ultrasound of the Week}}</ref>]]

Triplets can be either fraternal, identical, or a combination of both. The most common are strictly fraternal triplets, which come from a polyzygotic pregnancy of three eggs. Less common are triplets from a dizygotic pregnancy, where one zygote divides into two identical fetuses, and the other does not. Least common are identical triplets, three fetuses from one egg. In this case, sometimes the original zygote divides into two and then one of those two zygotes divides again but the other does not, or the original zygote divides into three.<ref>{{Cite web |title=Identical Triplets - What You Need to Know - Huggies AU |url=https://www.huggies.com.au/conception/twins-triplets-multiples/identical-triplets |access-date=2023-04-13 |website=www.huggies.com.au |language=en}}</ref>

Triplets are far less common than twins, according to the U.S. Centers for Disease Control and Prevention, accounting for only about 4,300 sets in 3.9 million births, just a little more than .1%, or 1 in 1,000.<ref name="Cohn-2015" /> According to the [[American Society for Reproductive Medicine|American Society of Reproductive Medicine]], only about 10% of these are identical triplets: about 1 in ten thousand.<ref name="Cohn-2015" /> Nevertheless, only 4 sets of identical triplets were reported in the U.S. during 2015, about one in a million.<ref name="Cohn-2015" /> According to Victor Khouzami, Chairman of Obstetrics at [[Greater Baltimore Medical Center]], "No one really knows the incidence".<ref name="Cohn-2015" />

Identical triplets or quadruplets are very rare and result when the original fertilized egg splits and then one of the resultant cells splits again (for triplets) or, even more rarely, a further split occurs (for quadruplets). The odds of having identical triplets is unclear. News articles and other non-scientific organizations give odds from one in 60,000 to one in 200 million pregnancies.<ref name="Cohn-2015">{{Cite news |last=Cohn |first=Meredith |date=October 23, 2015 |title=Rare identical triplets born to Baltimore couple |url=http://www.baltimoresun.com/health/bs-hs-identical-triplets-20151023-story.html |url-status=live |archive-url=https://web.archive.org/web/20151024022235/http://www.baltimoresun.com/health/bs-hs-identical-triplets-20151023-story.html |archive-date=October 24, 2015 |access-date=October 23, 2015 |work=[[The Baltimore Sun]]}}</ref><ref>{{Cite news |last=Keating |first=Caitlin |date=January 10, 2015 |title=1 in a Million Chance: Minnesota Mom Welcomes Identical Triplets |url=http://www.people.com/article/mother-gives-birth-to-identical-triplets |url-status=live |archive-url=https://web.archive.org/web/20150112232118/http://www.people.com/article/mother-gives-birth-to-identical-triplets |archive-date=January 12, 2015 |access-date=January 15, 2015 |work=[[People (magazine)|People]]}}</ref><ref>{{Cite news |date=August 8, 2007 |title=Rare identical triplets born in Austria |url=https://www.reuters.com/article/us-austria-triplets-idUSL0863741620070808 |url-status=live |archive-url=https://web.archive.org/web/20150904083509/http://www.reuters.com/article/2007/08/08/us-austria-triplets-idUSL0863741620070808 |archive-date=September 4, 2015 |access-date=January 15, 2015 |work=Reuters |location=Vienna}}</ref><ref>{{Cite news |last=Mohney |first=Gillian |date=December 5, 2013 |title=Identical Triplets, Conceived without Fertility Drugs, are 'One in a Million' |url=https://abcnews.go.com/Health/naturally-conceived-identical-triplets-born-sacramento/story?id=21109889 |access-date=January 15, 2015 |work=[[ABC News (United States)|ABC News]]}}</ref><ref>{{Cite web |last=Fierro |first=Pamela Prindle |date=December 15, 2014 |title=Identical Triplets |url=http://multiples.about.com/od/triplets/a/identtriplets.htm |url-status=live |archive-url=https://web.archive.org/web/20150309003513/http://multiples.about.com/od/triplets/a/identtriplets.htm |archive-date=9 March 2015 |access-date=15 January 2015 |website=[[About.com]]}}</ref><ref>{{Cite web |title=Mothers of Supertwins: Supertwins Statistics |url=http://www.mostonline.org/facts_outsideresources.htm |url-status=dead |archive-url=https://archive.today/20150118144610/http://www.mostonline.org/facts_outsideresources.htm |archive-date=January 18, 2015 |access-date=January 15, 2015}}</ref>