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Optimal nutrition in the early years of life, particularly during the first 1,000 days—from conception to a child’s second birthday—is critical for rapid growth and development, laying the foundation for lifelong health. Exclusive breastfeeding during the first six months is indispensable for optimal growth, yet as infants grow, breastmilk alone becomes insufficient to meet their evolving dietary needs. Thus, the introduction of age-appropriate, diverse, and nutrient-rich complementary foods, alongside continued breastfeeding for up to two years and beyond, is paramount. Despite the well-established benefits of complementary feeding, a significant gap persists between recommended and actual practices, particularly in low- and middle-income countries (LMICs). In response, Supplementary Feeding Programs (SFPs) are being implemented worldwide to combat malnutrition and bridge gaps in complementary feeding practices. These initiatives typically provide nutrient-dense foods or fortified supplements to complement home diets in preschool, daycare, or community programs, or as take‐home or home‐delivered rations. However, the effectiveness of these interventions has been constrained by limited coverage, suboptimal implementation, and contextual barriers affecting caregiver acceptance and program sustainability. To address these limitations, there is growing recognition of the need to integrate Social and Behaviour Change Communication (SBCC) components into nutrition programs. Integrating SBCC has been shown to improve caregiver knowledge, feeding practices, and dietary outcomes. Although interventions involving information, education, and counseling have shown promising results, their long-term scalability and sustainability continue to pose challenges. The present scoping review aims to systematically map the global landscape of SFP and SBCC interventions targeting children less than 5 years. The review will focus on their impact on dietary, anthropometric, biochemical, microbiological, and IYCF outcomes, highlighting lessons learnt and identifying successful strategies. Additionally, the review will explore contextual factors influencing program success and pinpoint evidence gaps. The findings will assist in informing the design and implementation of evidence-based programs to optimize child nutrition and health outcomes.