The number of children born to at least one unauthorized-immigrant parent in 2009 was 350,000 and they made up 8 percent of all U.S. births, essentially the same as a year earlier.
Although the number of unauthorized immigrants in the U.S. is below 2007 levels, it has tripled since 1990, when it was 3.5 million and grown by a third since 2000, when it was 8.4 million.
Source: Pew Hispanic Center, “Unauthorized Immigrant Population: National and State Trends, 2010, February 2011.