Connecticut high school ties the Guinness World Record for most sets of twins in a year . The remarkable increase is largely attributed to the increasingly older age of mothers and the increased use of infertility treatments , which gained popularity in the 1980s and 1990s . Numbers can be attributed to dramatic increases in the number of multiple birth ##s . Multiple births have increased due to older age of mothers , increased use of infertility therapies .
Connecticut high school ties the Guinness World Record for most sets of twins in a year . Numbers can be attributed to dramatic increases in the number of multiple birth ##s . Multiple births have increased due to older age of mothers , increased use of infertility therapies .