Diarrhoea and growth faltering in early childhood are associated with subsequent adverse outcomes. This trial aimed to assess whether water quality, sanitation, and handwashing interventions alone or combined with nutrition interventions reduced diarrhoea or growth faltering. Overall the trial found that nutrient counselling and supplementation modestly improved linear growth, but that there was no benefit to the integration of water, sanitation, and handwashing with nutrition. Adherence was high in all groups and diarrhoea prevalence was reduced in all intervention groups except water treatment. Combined water, sanitation, and handwashing interventions provided no additive benefit over single interventions.

Also read WaterAid's reflections on these research findings here.