This document outlines the essential strategies, interventions and approaches that countries should include at a minimum in a comprehensive infant and young child feeding (IYCF) strategy. This guidance establishes a set of minimum policies, programmes, and interventions that the Association of Southeast Asian Nations (ASEAN) Member States should use as a part of a robust nutrition strategy to improve IYCF practices from birth to age 2 years old. The purpose of this document is to guide countries on how to protect and promote child diets and feeding practices through specific policies, actions, interventions and nutrition services that support optimal IYCF practices; and to improve implementation of the International Code of Marketing of Breast-milk Substitutes and subsequent relevant World Health Assembly (WHA) resolutions in the ASEAN Member States.