A growing number of firstborns in the USA have unmarried parents, reflecting dramatic increases since 2002 in births to cohabiting women, according to government figures out today. The percentage of first births to women living with a male partner jumped from 12% in 2002 to 22% in 2006-10 — an 83% increase. The percentage of cohabiting new fathers rose from 18% to 25%. The analysis, by the National Center for Health Statistics, is based on data collected from 2006 to 2010.