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This document article is based on a compilation of main facts, [http://www.susana.org/en/resources/library/details/2163 factsheet] that provides an overview on existing evidence and&nbsp; remaining research gaps regarding the link between inadequate sanitary conditions and its underestimated impact on undernutrition and stunting, particularly for children under five years of age. It is a clear plea for more rigorous research, policy coherence and cooperation between Health and Nutrition, WASH, Mental Health, Care Practices and Food Security sectors, and the need to adequately address and consider WASH&nbsp; as an integral part of nutrition interventions. It particularly highlights the impact of WASH interventions on mothers and children’s (under five years of age) nutritional and health status.&nbsp;&nbsp; An estimated 30% of all children in low-income countries suffer from undernourishment&nbsp; and WASH services can help to alleviate this:<br/>