From Pew Research:



"About 295,000 babies were born to unauthorized-immigrant parents in 2013, making up 8% of the 3.9 million U.S. births that year, according to a new, preliminary Pew Research Center estimate based on the latest available federal government data. This was a decline from a peak of 370,000 in 2007.

Births to unauthorized-immigrant parents rose sharply from 1980 to the mid-2000s, but dipped since then, echoing overall population trends for unauthorized immigrants. In 2007, an estimated 9% of all U.S. babies were born to unauthorized-immigrant parents, meaning that at least one parent was an unauthorized immigrant."