Among mothers of all ages, a majority — 59 percent in 2009 — are married when they have children. But the surge of births outside marriage among younger women — nearly two-thirds of children in the United States are born to mothers under 30 — is both a symbol of the transforming family and a hint of coming generational change.
One group still largely resists the trend: college graduates, who overwhelmingly marry before having children. That is turning family structure into a new class divide, with the economic and social rewards of marriage increasingly reserved for people with the most education.
The shift is affecting children’s lives. Researchers have consistently found that children born outside marriage face elevated risks of falling into poverty, failing in school or suffering emotional and behavioral problems.
Large racial differences remain: 73 percent of black children are born outside marriage, compared with 53 percent of Latinos and 29 percent of whites. And educational differences are growing. About 92 percent of college-educated women are married when they give birth, compared with 62 percent of women with some post-secondary schooling and 43 percent of women with a high school diploma or less, according to Child Trends.
Almost all of the rise in nonmarital births has occurred among couples living together. While in some countries such relationships endure at rates that resemble marriages, in the United States they are more than twice as likely to dissolve than marriages. In a summary of research, Pamela Smock and Fiona Rose Greenland, both of the University of Michigan, reported that two-thirds of couples living together split up by the time their child turned 10.