One in three children in Peru was growing up too short for their age, stunted by a lack of the right foods in their diet.
Then in 2005, the government put in place an innovative new system. They gave cash hand-outs to poor mothers but only on the condition that they had regular health check-ups and their children went to school.
By 2014 the number of children growing up too small had halved.
World Hacks tells the story.
Presented by Sahar Zand.
Image caption: Mother and child part of the malnutrition programme / Image credit: BBC
