KOLKATA, INDIA — In Cox’s Bazar, Bangladesh, Rohingya Muslim refugee Anwara Begum, 55, choked back tears as she tried to cajole her 7-year-old granddaughter, Umme Habiba, into swallowing a morsel of food. Habiba was unconsolable, wailing in grief for her 27-year-old mother, Hatemon Nesa, and her 5-year-old sister,...