Mother-of-two Esperence Ndayishimiye, (26) measures the MUAC (mid-upper arm circumference) of her son Blaise. Esperence is bringing up her young children on her own after her husband abandoned her. Her makeshift house constructed from sticks and leaves overlooks Lake Kanzigiri in Busoni, in the far north of Burundi. Blaise is acutely malnourished and weighs only 6.2 kilos. 'Blaise can only eat when there is food. But there are many times we don't have anything and we go to sleep without eating. We can only eat when I find casual work. Sometimes a whole week passes without finding anything, and all we can do is eat cassava leaves.'