Nigeria, Sept. 11 -- A devastating malnutrition crisis is unfolding across northern Nigeria. In Kebbi state, since June more than 400 severely malnourished children have been hospitalized each week in the inpatient therapeutic feeding centers Doctors Without Borders/Medecins Sans Frontieres (MSF) runs, while over 1,400 are admitted for outpatient care weekly.

These numbers are staggering-and they're still rising. The situation is so dire that our teams have had to stop treating children with moderate acute malnutrition because so many others are in more critical condition.Katrin Kisswani, a nurse and president of MSF Belgium, has just returned from Kebbi. Here, she shares what the team is witnessing on the ground, day after day.

"She wa...