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 Bangladesh. 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 Bangladesh, the community-based component was implemented by BRAC, a large nongovernmental organization through its Essential Health Care (EHC) program. The evaluation uses a cluster-randomized controlled design with repeated cross-sectional baseline and endline surveys. Twenty rural subdistricts (upazilas) that are part of BRAC’s EHC program platform for A&T were purposively chosen, then randomly assigned either to A&T (intensive) or to comparison upazilas (non-intensive). The baseline survey was conducted in the 20 upazilas across five divisions in Bangladesh between April and August 2010 by the IFPRI team in collaboration with Data Analysis and Technical Assistance, Ltd. (DATA). Data collection tools and questionnaires were developed based on UNICEF conceptual framework for child growth and development and on the A&T model framework.