We are conducting a randomized controlled study accompanied by the collection of mixed methods implementation data to assess the effectiveness of ACF's Baby Friendly Spaces (BFS) program delivered to Rohingya refugee mothers in Cox's Bazar, Bangladesh. Although psychosocial support programs are implemented globally to refugees, there is a lack of formal scientific research documenting evidence of their impact on caregivers of young children or providing guidance for their effective implementation. Responding to this gap in knowledge, we aim to: evaluate the extent to which BFS services contribute to improved maternal and child health outcomes for forcibly displaced lactating Rohingya mothers and their young children; examine key implementation factors related to these outcomes (e.g., fidelity, sustainability); and explore what would be needed to adapt this program for delivery to Bangladeshi mothers and their young children seeking services in host community clinics within Cox’s Bazar.