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OBJECTIVES In 2019, >71 million children aged METHODS This article uses exploratory multiple case study methodology, drawing from implementation and qualitative data from 3 interventions: a mobile phone-based intervention promoting nurturing care among Rohingya and crisis-affected host communities in Bangladesh; Reach Up amid acute violence and displacement in Northeast Syria; and Reach Up group sessions and home visits integrated with health services for an indigenous population in Venezuela. RESULTS In Bangladesh, tailoring interactive voice response messages improved responsiveness to the developmental needs of young children, yet complementary in-person services were identified as a key program enhancement. In Syria, rapid adaptations of Reach Up addressed the needs of families in acute crisis, including social–emotional learning games for school-aged children. In Venezuela, Reach Up, coupled with complementary lactation counseling, yielded high rates of uptake and satisfaction, and children’s language development was highlighted as a key area of growth. CONCLUSIONS Recommendations to promote early childhood development in crisis and conflict settings include: (1) cultural adaptation based on a holistic understanding of children and caregivers’ needs; (2) the integration of child and family safety and linkages with complementary services on the basis of community needs and priorities, and (3) the importance of designing for scale through blended models and costing analyses.