‘They cry of hunger once they notice there’s no milk’

Baby Ummi's adoptive mother is struggling to make enough breastmilk for her.

Like many families in northern Nigeria, they can no longer afford the meals they need.

In fact, 4.4 million children under five are acutely malnourished here - more than double last year's figure, according to the World Food Programme.

The BBC's Madina Maishanu visits families in Katsina state to find out why.

Produced by Ifiokabasi Ettang, Madina Maishanu and Ellen Tsang.

Filmed and edited by Ifiokabasi Ettang.