In 2011, the latest figures available from the ESRI, Ireland reported the highest fertility rate of any of the 27 EU countries, at 16.2 births per 1,000 population.
The twinning rate for 2011 was 18.1 per 1,000 maternities, compared with a twinning rate in 2010 of 16.7 per 1,000 maternities. Multiple births in 2011 included 1,319 sets of twins, 28 sets of triplets and 1 set of quadruplets.
Multiple Births in Ireland
Source: ESRI Perinatal Statistics Report 2011, Health Research and Information Division, December 2012