Background: Nutritional status is an essential indicator of child health and development. Regular attendance at community-based integrated health service posts (Posyandu) enables early monitoring of child growth, nutritional assessment, and health education for mothers. This study aimed to examine the relationship between mothers' compliance with Posyandu visits and the nutritional status of children under five at Posyandu Melati, Tanjung Karangan Village. Methods: This quantitative study employed a cross-sectional design. A total of 62 mothers with children under five were selected from a population of 135 using purposive sampling. Mothers' compliance with Posyandu visits was assessed using a modified Morisky Medication Adherence Scale (MMAS-8), while children's nutritional status was determined using the weight-for-age (W/A) index. Data were analyzed using descriptive statistics and the Chi-square test. Results: Most respondents demonstrated high compliance with Posyandu visits (88.7%), and the majority of children had good nutritional status (80.6%). Bivariate analysis revealed a statistically significant relationship between mothers' compliance with Posyandu visits and the nutritional status of their children (p = 0.000). Mothers with high compliance were approximately 4.25 times more likely to have children with good nutritional status than those with low compliance. Conclusion: Mothers' compliance with regular Posyandu visits is significantly associated with the nutritional status of children under five. Strengthening community participation through continuous health education and support from healthcare workers and Posyandu cadres is essential to improve child nutrition and prevent malnutrition.
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