OUAGADOUGOU, Burkina Faso—Martine Roamba’s 10-month-old daughter weakly tugs at her mother’s breast searching for milk. The malnourished baby has been struggling to feed since birth as her mother hasn’t had enough to eat to produce sufficient breastmilk since fleeing her village in northern Burkina Faso last year when jihadis started killing people. Seated on a…