This dataset is the result of an impact evaluation study undertaken to assess the impact of Alive & Thrive's (A&T) at-scale interventions that combine intensive interpersonal counseling, mass media, and community mobilization in Vietnam. A&T is a six-year initiative to scale up nutrition to save lives, prevent illness, and ensure healthy growth and development through improved infant and young child feeding (IYCF) practices in Bangladesh, Ethiopia, and Viet Nam. In Vietnam, A&T applied principles of social franchising within the government health system to deliver the interventions. The evaluation uses a cluster-randomized controlled design with repeated cross-sectional baseline and endline surveys in the same communities over time. The baseline survey was conducted in 40 communes across four provinces, Thai Nguyen, Thanh Hoa, Quang Ngai, and Vinh Long, between June and August 2010 by the IFPRI team in collaboration with the Institute of Social and Medicine Studies (ISMS). Data collection tools and questionnaires were developed using a UNICEF conceptual framework for child growth and development as a reference, and based on the A&T franchise model framework.