In 1990, there were more births to teenagers than to women ages 35 and older. By 2008, that had reversed — 14% of births were to older women and 10% were to teens. Births to women ages 35 and older grew 64% between 1990 and 2008, increasing in all major race and ethnic groups.

Another notable change during this period was the rise in births to unmarried women. In 2008, a record 41% of births in the United States were to unmarried women, up from 28% in 1990. The share of births that are non-marital is highest for black women (72%), followed by Hispanics (53%), whites (29%) and Asians (17%), but the increase over the past two decades has been greatest for whites — the share rose 69%.

Just over half of births (53%) in 2008 were to white women, and a quarter (24%) were to Hispanic women. More than half of the mothers of newborns (54% in 2006) had at least some college education. One-in-four (24% in 2004) was foreign born.