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Increasing age of women at motherhood and artificial insemination may be causing an increase in twin births in the US.

In 2014, around 33.7 twin births were registered for every 1,000 births according to the National Vital Statistics Report given out by the CDC. The report also revealed that the mean age of mothers giving birth to twins was 28.7 years in 2014, up from 25.4 years in 1980. The average age of US mothers today is 28.3 years.

The report revealed that the highest birth rate of twins was in New Jersey (43.1), Massachusetts (42.8) and Connecticut (40.5). In absolute terms however, California, Texas and New York recorded the maximum number of twin births. Nearly 400,000 twins were born in the US.

In 2013, the rate of twin birth was 33.7, UPI reports while adding that rate of triplet and other higher-order births reduced by 40 percent since 1998.

Around 1.6 million births babies were born out of the wedlock, with black women registering the highest percentage of such births. The average age of black mothers, 26.9 years, was lower than Hispanic and White mothers, the report shows.

CDC's report also revealed that 381,321 preterm births were recorded last year, with black mothers recording the highest percentage of preterm births. The report also shows that more births happened on Tuesday than other days in 2014 while July recorded the highest number of births. January and June reported the highest fertility rate.