One out of every 30 babies born in the United States will be born a twin according to new statistics reported this week that show the number nearly doubling in the last 20 years.
With more women using fertility treatments and giving birth at older ages, the likelihood for twins, triplets and other multiples have drastically increased, according to researchers from Michigan State University and the Centers for Disease Control and Prevention.
Their report found that in 2009, a pair of twins were born for every 30 babies compared to 1980's findings of one pair out of every 53.
Baby boom: New statistics report that one out of every 30 babies born in the US will be born a twin, nearly doubling the chances in the last 20 years thanks to more older women giving birth and fertility treatments
For triplets, in 2009 they were reported in every 651 babies. That’s over four times as many as in 1980 when 2,702 reported.
'Older maternal age accounts for about one-third of the rise, and two-thirds is due to the increased use of fertility treatments,' said Dr Barbara Luke, a researcher at MSU’s College of Human Medicine's Department of Obstetrics, Gynaecology and Reproductive Biology in a statement.
En vogue: The most recent findings are based on births reported in 2009 which was one year after singer Jennifer Lopez (left) and actress Angelina Jolie (right) gave birth to her own sets of twins
Singers: Mariah Carey and husband Nick Cannon (left) also gave birth to twins last year, while Celine Dion gave birth to them in 2010 with husband Rene Angelil (right)
Dr Luke presented her findings this week to the 14th Congress of the International Society of Twin Studies in Florence, Italy.
'With multiple births though there are greater health risks,' Dr Luke added.
More adverse health outcomes are connected to those using the treatments in comparison to pregnancies through spontaneous-conception, according to the research.
Dr Luke's work noted that roughly 12 per cent of US women have undergone fertility therapies.
'Continued research is necessary to improve outcomes,' she said, finding the foetuses from surviving embryos after in vitro fertilization more likely to have a lower birth weight.
CELEBRITIES WITH TWINS
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