Setting and study population
Data for this study were collected as part of a cluster‐randomised controlled trial at the JiVitA Research Site located in Gaibandha District in Rangpur Division in northwestern Bangladesh (clinical registration No. NCT03683667). The site has been divided into 566 clusters and has a population of about 630,000. It has hosted several studies of maternal and child health and is representative of national rural infrastructure, maternal and child nutritional status, and health and nutrition services (Christian et al., 