Fertility of American Women: 2006
"A new Census Bureau report on fertility shows that 20 percent of women 40 to 44 were childless in 2006, twice as high as the level 30 years earlier. Among other highlights, the report, Fertility of American Women: 2006, found:

* The majority of women with a recent birth (57 percent) were in the labor force.
* Of the 4.2 million women who had a birth in the previous 12 months, 36 percent were separated, widowed, divorced or never married at the time of the survey. Of these 1.5 million unmarried mothers, 190,000 were living with an unmarried partner.
* Second generation Hispanic women tend to have lower fertility rates than either foreign-born Hispanics or those who were third generation (i.e., native and of native parents).
* The highest levels of current fertility (67 births in the year prior to the survey per 1,000 women) were among those with a graduate or professional degree."