The number of twins born in Norway has increased by almost 100 percent since the 1970’s.
Figures also show that 1,015 sets of twins were born in 2010 compared to the 600 that were born in 1970.
The rise in twin births has previously been believed to be down to the increase in treatments such as IVF (in vitro fertilisation) but this may not be the case, western Norway paper Bergensavisen reports.
In 2012, Haukeland University Hospital saw 110 twin births, three sets of triplets. Only nine twin births were as a result of this treatment.
Dr. Anne Tandberg from the Women’s Clinic at the hospital has a new explanation for the increase in the number of twins.
She believes that women choosing to have children later in life could be the reason as ovulation is not as regulated.
Dr Tandberg also thinks a cause for the rise could be other treatments that are available to women to increase their chances of becoming pregnant, such as ovulation stimulants.
According to her, women who struggle to have children often use these.
“We see a large increase in the consumption of these drugs. Two or more eggs can release simultaneously by using this treatment,” she said.