This radio segment from NPR tells the story of a family from Honduras who were separated by Border Patrol as they entered the United States. According to the segment, the father and son were immediately turned away and sent back to Mexico upon entry, "but the mother, who was pregnant, was in pain. So Border Patrol agents took her to a nearby hospital, where she gave birth."
"Two days later, the mother was given a choice: Go back to Mexico with or without her newborn, who is a U.S. citizen by birthright."