Background: Posyandu are the primary venues for monitoring the growth of toddlers in the community; however, the national prevalence of stunting remained virtually unchanged from 2022 to 2023. Objective: To compare the prevalence of stunting across provinces in the 2022 SSGI and the 2023 SKI and to examine its consistency with trends in growth monitoring indicators at Posyandu. Methods: An ecological study using publicly available secondary data from the Ministry of Health. Changes in prevalence across 32 provinces with comparable geographical boundaries were tested using the Wilcoxon test and paired t-tests; regional differences were tested using the Mann–Whitney test; and Posyandu indicators from 2021–2023 were compared descriptively. Results: The median provincial prevalence was 21.6% (IQR 18.6–27.0) in 2022 and 22.3% (IQR 17.9–25.3) in 2023 (Wilcoxon p = 0.41); 17 provinces showed a decrease and 15 showed an increase. Only three provinces fell below the 14% target, and provinces outside Java–Bali had a higher median (24.6% vs. 18.0%; p = 0.021). The proportion of toddlers whose growth was monitored increased from 68.9% to 82.2% (2021–2023), while only 55.8% of toddlers were weighed ≥8 times a year. Conclusion: Increased administrative coverage of posyandu has not been accompanied by a significant reduction in stunting; strengthening the quality of monitoring, follow-up, and the role of village midwives is necessary.
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