Methods: We will conduct a mixed-methods, parallel cluster randomised controlled trial with baseline measures. 120 clusters comprising small urban and rural communities will be recruited in equal numbers and randomly allocated in a 1:1 ratio to either treatment or control arms. Participants will be mother-child dyads (27 per cluster period) with children aged 6 to 24 months. Data collection will comprise a day of observation and interviews with each participating mother-child pair and will take place at baseline and four and 15 months post-intervention. The primary analysis will estimate the effectiveness of the intervention on changes to complementary food safety and preparation behaviours, food and water contamination, and diarrhoea. Secondary outcomes include maternal autonomy, enteric infection, nutritional content of meals, and child anthropometry. A secondary structural equation analysis will be conducted to examine the causal relationships between the different outcomes.
Conclusions: The trial will provide evidence on the effectiveness of community-based behavioural change and educational interventions designed to reduce the burden of diarrhoeal disease in the under fives, and how effectiveness varies across different contexts.