The recent birth statistics from the Centers for Disease Control reveal that the number of twins born in the United States reached a new high in 2014, UPI records.
The CDC report said that 33.9 twins were born out of every 1,000 births in the U.S. last year.
The most twin births were recorded in the three most populated states of California, Texas and New York, respectively. The lowest rate of twin births was in New Mexico (24.0).
The twin birth rate have been rising for white, African-American and Hispanic women since 1980. However, in the year 2013-2014, the rate only rose for African American women by 4 percent.
The higher occurrence of twin births is attributed to, though not specifically known, to more women giving birth later in life and using in vitro fertilization.
Also, in contrast to the rise in the rate of twin birth, the rate for triplets or higher-order dropped another 5 percent (113.5 per 100,000 births), and has fallen by 40 percent since 1998.
Researchers said changes in fertility treatments might have contributed to the decline in birth rates of triplets and higher multiples.
According to Valuewalk, the CDC noted that there was a 9% decline in the birth rate among teen mothers in the age group 15-19 since 2013.
The birth rate among women in early 20s fell by 2% to 79 per 1,000.
