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 ASEAN Member States. The intended audiences of the document are health, nutrition and other relevant sectoral staff in ASEAN Member State governments, programme managers and planners. This document should guide government staff and programme managers on essential strategies, interventions and approaches as they seek to design, implement, modify and monitor the minimum set of IYCF policies, programmes and interventions. This guidance document should be used alongside other ASEAN guidance documents that have complementary sections (i.e., Integrated Management of Acute Malnutrition, Maternal Nutrition, Marketing of Unhealthy Food to Children) and with reference to the global resources and guidelines that provide more in-depth information on specific elements. The guidance is applicable at national and subnational levels but has been written with a national focus. For countries with decentralized health systems, the guidance and minimum standards can be equally applied to more local level planning. In 2017, ASEAN adopted the ASEAN Leaders Declaration on Ending All Forms of Malnutrition during the 31st ASEAN Summit. To realize these commitments, the ASEAN Health Ministers Meeting adopted the ASEAN Strategic Framework and Action Plan on Nutrition 2018–2030, which identifies activities and outputs. The development of the ASEAN Guidelines and Minimum Standards for the Protection, Promotion and Support of Complementary Feeding is one of these activities.