The Department of State’s Bureau of Consular Affairs assists in cases of international parental child abduction. We place the highest priority on the welfare of children who have been abducted across an international border. The Bureau’s Office of Children’s Issues is prepared to assist you in your efforts to return your abducted child to his or her country of habitual residence.
Mexico-specific details can be found here.
More information on International Parental Child Abduction is available here.