The authors analyzed data from three rigorously conducted trials, WASH Benefits Bangladesh, WASH Benefits Kenya, and the SHINE trial in Zimbabwe, to evaluate the impact of household-level Water, Sanitation, and Hygiene (WASH) interventions, as well as Infant and Young Child Feeding (IYCF) programs, on child health outcomes. The WASH interventions included measures such as drinking water chlorination, improved latrine construction, and the provision of handwashing stations. Despite high levels of compliance, WASH interventions alone did not lead to improvements in child linear growth in any of the three countries. In contrast, IYCF interventions consistently resulted in modest but positive increases in children's length-for-age Z scores, ranging from approximately 0.13 to 0.25 across all trials. Combining WASH and IYCF interventions offered no additional growth benefits beyond those achieved by IYCF alone. With respect to diarrhoea, reductions were observed only in Bangladesh, where the intervention included frequent promotional visits (six times per month). In Kenya and Zimbabwe, where promotional visits occurred only monthly, no reductions in diarrhoea were observed. These findings suggest that observed associations between household sanitation and child stunting in observational studies may be confounded by underlying socioeconomic factors, and that randomized trial results do not support a causal relationship. Overall, the results indicate that household-level WASH interventions, as currently designed and implemented, are likely insufficient to improve child growth outcomes. Achieving meaningful health impacts may require more transformative or community-scale approaches that can significantly reduce exposure to fecal contamination and enteric pathogens.