Using data that ended in 2008 (but the basic pattern has continued), children of immigrant parents were above 30% of all children in some states.
Young children of immigrants account for more than 30% of children in seven states and 20–30% of children in 12 states. Children of immigrants accounted for between 10 and 20% of children in 18 states. Their share is lower in the remaining 14 states (less than 10%). The seven states with over 30% in 2008 were CA, TX, NV, AZ, FL, NJ and NY.
The number of young children of immigrants doubled between 1990 and 2008; this increase accounts for the entire growth in the U.S. population of young children since 1990. Currently, 8.7 million U.S. children age 0 to 8 have at least one foreign-born parent, a doubling from 4.3 million in 1990. By contrast, the number of children with native-born parents has declined slightly from 27.8 million in 1990 to 27.3 million in 2008. Thus, children of immigrants accounted for the entire growth in the number of young children in the United States between 1990 and 2008.
In 2008, 43% of the immigrant parents of children were from Mexico. This percentage has probably declined somewhat since 2008 because of the flattening out of migration from Mexico compared with the growth of Asian and Central American immigrants.