More children are being born to women over 35 than to teens, Pew study finds

The Washington Post reports:

Between 1990 and 2008, the number of births to mothers older than 35 leapt from 368,000 to 603,000. One in seven babies -- or 14 percent of a total of about 4 million births -- were born to older mothers in 2008. Almost one in four were first-time mothers. The vast majority, 71 percent, had at least some college education before giving birth.