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Objective: The aim of this review is to identify economic evidence and approaches used in evaluation of early-life interventions to promote healthy eating in the first 1000 days in community, education, and home settings and establish evidence gaps. Design: Five databases and 5 websites were searched using key words. Findings are presented using a narrative synthesis. Setting: Home, education, and community settings Participants: Pregnant women, infants and young children 0-2 years old Results: Economic evaluations presenting costs and consequences published in English peer-reviewed journals were selected. Overall, the 24 included studies demonstrated mixed quality. Based on CHEERS 2022, titles, comparators, and outcomes were commonly reported, whereas health economic analysis plan (HEAP), heterogeneity, and uncertainty were least reported. Four studies stated the analytical perspectives with clear decision contexts, making the results useful in decision-making. Several studies had a time horizon of 1 year or shorter with unclear decision-context. Four studies presented relatively transparent methods, with the interpretation of results from cost-utility analyses being informative for decision-making. Conclusions: This review identified consistent methodological challenges in the economic evaluation of early-life nutrition interventions. Comparators were inconsistently defined, with the varied definition of ‘standard care’ across studies and settings, limiting comparability and decision relevance. Furthermore, most studies adopted short time horizons, often one year (or shorter), limiting the ability to capture longer-term outcomes such as obesity, educational attainment, and life-course health impacts. Chosen outcomes were narrow, focusing on immediate health outcomes without consideration of broader or downstream effects. In addition, socioeconomic characteristics or exploring differential effects across population groups were rarely reported in the included studies. Addressing these identified issues require more robust and transparent approaches to economic evaluation. Incorporating a HEAP as an integral part of a study protocol ensures that key methodological elements (such as the economic question, PICO, analytical perspectives, time horizons, the approaches to handling uncertainties, and decision contexts) are pre-specified and aligned with decision contexts to support evidence-based decision-making.