By Nicole Acevedo, NBC News

One in 4 children in the United States have at least one immigrant parent — underscoring the nation’s growing diversity and the impact that policies surrounding immigration and families can have on so many children.

About 18.6 million children have at least one foreign-born parent, according to a new report from the Urban Institute. About 7 million of the immigrant parents — almost 4 in 10 — are from Mexico, with another 3.5 million from Central and South America, and the rest from around the globe.

Immigrant parents don’t mean these families are new to the U.S.

In fact, more than three-quarters of children have parents who have been in the U.S. more than a decade. Only 11 percent have been in the U.S. for fewer than five years.

In addition, “the majority of the parents are immigrants (61 percent) who are U.S. citizens,” Hamutal Bernstein, a senior research associate at the Urban Institute, said. More than 9 in 10 children (91 percent) are U.S. citizens.

Read more here.

1 in 4 Children Have Immigrant Parents. Are U.S. policies reflecting that reality?