Water, sanitation and hygiene (WASH) interventions should support infant growth but trial results are inconsistent. Frequently, interventions do not consider behaviors or transmission pathways specific to age. A household playspace (HPS) is one intervention component, which may block fecal-oral transmission. This study was a two-armed, parallel group, randomized, controlled feasibility trial of a HPS in rural Ethiopia. It aimed to recommend proceeding to a definitive trial. Secondary outcomes included effects on infant health, injury prevention and women’s time.