The nation’s racial and ethnic minority groups—especially Hispanics—are growing more rapidly than the non-Hispanic white population, fueled by both immigration and births. This trend has been taking place for decades, and one result is the Census Bureau’s announcement that non-Hispanic whites now account for a minority of births in the U.S. for the first time. The findings are included in the bureau’s first set of national population estimates since the 2010 Census, when 49.5% of babies under age 1 were minorities.

Minorities accounted for 93.3% of the nation’s population growth from April 1, 2010 (Census day) to July 1, 2011, according to Census Bureau data released today. Of the total population growth of 2.8 million during that period, the total increase for non-Hispanic whites was only 192,000.

Among black and Hispanic mothers, births peak among women in their early 20s. For white and Asian mothers, births peak among women in their late 20s and early 30s. Looking at educational attainment differences among groups, most white and Asian mothers are college educated, while most Hispanic and black mothers are not.