Tara Neubrand is a pediatric emergency-medicine physician at a large hospital in Denver, Colorado, which has one of the main pediatric trauma centers in the area. She and her colleagues frequently treat kids who have been abused or have experienced other traumatic events, and who have been placed in the foster-care system. Since April, she has seen three toddlers from Guatemala and Honduras—two boys and a girl who were forcibly separated from their parents by Border Patrol agents at the U.S.–Mexico border.