2 University College London, London, United Kingdom.
3 London School of Hygiene & Tropical Medicine, London, United Kingdom; University of Aberdeen, Aberdeen, United Kingdom; The SoapBox Collaborative, Aberdeen, United Kingdom.
4 London School of Hygiene & Tropical Medicine, London, United Kingdom.
5 UNICEF, New York, United States of America.
6 World Health Organization, Geneva, Switzerland.
7 United Nations Population Fund, New York, United States of America.
8 BRAC and BRAC University, James P Grant School of Public Health, Dhaka, Bangladesh.
9 Evidence for Action (E4A), Bugando Consultant, Teaching Hospital, Dar es Salaam, Tanzania.
Yael Velleman and colleagues argue for stronger integration between the water, sanitation, and hygiene (WASH) and maternal and newborn health sectors. Please see later in the article for the Editors' Summary.