INTRODUCTION
LITTLE, DISEASE, SECONDARY, UNDERNUTRITION
Despite some progress over the last two decades, child undernutrition remains a public health concern in low‐ and middle‐income countries (Victora et al., Integrated agriculture and nutrition programmes have been shown to improve diet diversity and consumption of nutritious foods (Kadiyala et al., Intensification of livestock production may pose child‐health‐related risks through increased exposure to livestock‐related pathogens, resulting in an elevated burden of disease (Penakalapati et al., Little attention has been paid to date in livestock interventions to the prevention of EED through improved poultry–husbandry and hygiene promotion. Similarly, WASH interventions have focused on reducing exposure to human faeces, even though animal faecal matter is arguably more widespread in rural, low‐income contexts (Zambrano et al., In this paper, we address these evidence gaps by assessing the impact of SELEVER (Soutenir l'Exploitation Famaliales pour Lancer l'Elevage des Volailles et Valoriser l'Economie Rurale, or Women's Poultry Programme to Improve Income and Nutrition), a nutrition‐ and gender‐sensitive poultry value chain intervention, with and without additional livestock WASH behaviour change, to improve household hygiene practices, reduce child morbidity and improve anthropometric indices of nutrition status in young children in rural Burkina Faso. We also examine whether treatment effects varied by season. This analysis was pre‐specified in the SELEVER trial protocol and focuses on child morbidity and child anthropometry, both secondary outcomes of the trial; the analysis also includes a seasonal WASH substudy (Gelli, Becquey, et al., 