In 2005, Nick Danziger began to create an archive of photographs documenting the lives of women and children in eight countries around the world. He returned five years later, and again in 2015. Had the millennium development goals made a difference to their lives? Over the next few weeks, we feature the families from the countries he photographed, beginning with Niger. Click on the images below to read their stories (more images will be revealed as the weeks go by). These photographs form part of an exhibition, Revisited, which runs at Columbia University in New York until 15 October, and at London’s Royal Geographic Society, 2-6 November