Fox News Latino/The Associated Press, 07/18/2012
More than 300,000 U.S.-born children have been brought to Mexico since 2005, out of a total of 1.4 million people who moved back from the U.S. during that period, according to the Washington-based Pew Hispanic Center.
Because of the byzantine rules of Mexican and U.S. bureaucracies, tens of thousands of those children without Mexican citizenship now find themselves without access to basic services in Mexico — unable to officially register in school or sign up for health care at public hospitals and clinics that give free check-ups and medicines.

