Complementary feeding (CF) contributes to child growth and development, but few CF programs are delivered at scale. Alive & Thrive (A&T) addressed this in Bangladesh through intensified interpersonal counseling (IPC), mass media (MM), and community mobilization (CM). This work was evaluated to show the impact of providing IPC + MM + CM (intensive) compared with standard nutrition counseling + less intensive MM + CM (non-intensive) on CF practices and anthropometric measurements. Complementary feeding improved significantly in the intensive compared to the non-intensive group for minimum dietary diversity, minimum meal frequency, minimum acceptable diet, and consumption of iron-rich foods. Largescale program delivery was feasible and, with the use of multiple platforms, reached 1.7 million households. This study establishes proof of concept for large-scale behavior change interventions to improve child feeding.