Background: Stunting remains a significant public health concern in Indonesia because of its long-term effects on children's physical growth, cognitive development, and future human capital. Exclusive breastfeeding during the first six months of life is a primary strategy to prevent stunting. Breast milk provides optimal nutrients and bioactive components that support healthy growth, strengthen immunity, and promote infant development. This study aimed to investigate the relationship between exclusive breastfeeding and stunting among children under five years of age in the working area of Damuli Primary Health Center, Patani Timur District, Central Halmahera Regency. Methods: This observational study employed a cross-sectional design and was conducted from March to May 2026. The sample consisted of 50 mothers with children aged 24–59 months, selected using total sampling. Data on exclusive breastfeeding history were collected through structured interviews using a questionnaire, while stunting status was assessed based on height-for-age according to the World Health Organization (WHO) Child Growth Standards. Data were analyzed using descriptive statistics and the Chi-square test with a 95% confidence level. Results: Most children were exclusively breastfed and were not classified as stunted. Exclusively breastfed children had a lower incidence of stunting than those who were not exclusively breastfed. The Chi-square test showed a significant relationship between exclusive breastfeeding and stunting (p=0.001). Conclusion: Exclusive breastfeeding was significantly associated with stunting among children under five. Promoting exclusive breastfeeding, growth monitoring, and nutritional education should remain priorities in stunting prevention efforts.
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