This study demonstrates that implementing two breastfeeding promotion policies in Viet Nam – an extended maternity leave policy and further restrictions on marketing of breastmilk substitutes – resulted in positive outcomes, facilitated by several factors. Analysis reveals that facilitators to implementation include policy precedence, a broad set of policies to promote the rights of women and children, and involvement from national- and international-level stakeholders. The article additionally explores implementation challenges and includes recommendations to facilitate a supportive policy environment in Viet Nam.