Latar Belakang Penurunan usia menarche di Indonesia menyebabkan sebagian siswi SD telah mengalami menstruasi pada usia dini, sehingga meningkatkan risiko ketidaksiapan dalam menjaga kesehatan menstruasi. Dalam konteks masyarakat Sunda, faktor sosiokultural turut memengaruhi pemahaman dan praktik menstruasi, sehingga diperlukan pendekatan yang kontekstual dengan melibatkan ibu sebagai aktor utama. Penelitian ini bertujuan mengembangkan model edukasi berbasis sosiokultural untuk meningkatkan dukungan ibu terhadap kesehatan menstruasi siswi SD di Kabupaten Garut. Metode Penelitian menggunakan desain Mixed Method Exploratory Sequential Design dalam tiga tahap, yaitu studi kualitatif, pengembangan model, dan uji intervensi dengan desain quasi experiment. Penelitian dilaksanakan pada 16 SD di Kabupaten Garut pada  tahun 2024–2025. Sampel  adalah ibu siswi yang telah mengalami menstruasi sebanyak 166 orang, terdiri dari 83 kelompok intervensi dan 83 kelompok kontrol. Analisis data dilakukan menggunakan Generalized Estimating Equations (GEE) dan Difference-in-Differences (DiD). Hasil: Hasil penelitian kualitatif dan pengembangan model menghasilan edukasi Ambu Binangkit yaitu  model edukasi kesehatan menstruasi yang dikembangkan dengan pendekatan sosiokultural Sunda. Dengan analisis statistik GEE diperlihatkan bahwa skor dukungan ibu pada kelompok intervensi meningkat sebesar 18,30 (95% SK: 15,48–21,12; p < 0,001)  Hasil analisis DiD terdapat peningkatan skor dukungan ibu pada kelompok intervensi dibandingkan kelompok kontrol dengan koefisien sebesar 21,077 (p < 0,001). Intervensi model berkontribusi terhadap peningkatan dukungan ibu sebesar 68% pada posttest pertama  dan 77% pada posttest kedua   Peningkatan terbesar terjadi pada dukungan instrumental yaitu 20.15 (95% SK: 16.33–23.97; <0.001) dan dukungan pendampingan yaitu 19.06 (95%SK: 14.83–23.30;<0.001) sementara dukungan emosional dan informasional juga meningkat secara signifikan meskipun dengan besaran efek yang lebih rendah. Kesimpulan dan Saran Model Ambu Binangkit efektif dalam meningkatkan dukungan ibu terhadap kesehatan menstruasi anak melalui pendekatan sosiokultural yang kontekstual pada tatanan SD. Model ini berpotensi dikembangkan sebagai strategi intervensi berbasis keluarga dalam meningkatkan kesehatan menstruasi sejak usia SD. Implementasi model perlu diperkuat melalui integrasi dengan program sekolah dan layanan kesehatan guna menjamin keberlanjutan dan perluasan dampak Kata kunci: kesehatan menstruasi, dukungan ibu, sosiokultural, Ambu Binangkit, SD

Background: The declining age at menarche in Indonesia has resulted in some primary school girls experiencing menstruation at an early age, thereby increasing their risk of being unprepared to manage menstrual health. In the Sundanese community context, sociocultural factors influence menstrual understanding and practices, highlighting the need for a contextual approach that involves mothers as key actors. This study aimed to develop a sociocultural-based educational model to improve maternal support for the menstrual health of primary school girls in Garut Regency. Methods: This study employed an exploratory sequential mixed methods design conducted in three stages: a qualitative study, model development, and an intervention trial using a quasi-experimental design. The study was conducted in 16 primary schools in Garut Regency from 2024 to 2025. The sample consisted of 166 mothers of schoolgirls who had experienced menstruation, comprising 83 participants in the intervention group and 83 participants in the control group. Data were analyzed using Generalized Estimating Equations (GEE) and Difference-in-Differences (DiD). Results: The qualitative findings and model development process resulted in the Ambu Binangkit educational model, a menstrual health education model developed through a Sundanese sociocultural approach. The GEE analysis showed that maternal support scores in the intervention group increased by 18.30 points (95% CI: 15.48–21.12; p < 0.001). The DiD analysis indicated a greater increase in maternal support scores in the intervention group compared with the control group, with a coefficient of 21.077 (p < 0.001). The intervention model contributed to a 68% increase in maternal support at the first posttest and a 77% increase at the second posttest. The largest increases were observed in instrumental support, with a coefficient of 20.15 (95% CI: 16.33–23.97; p < 0.001), and accompaniment support, with a coefficient of 19.06 (95% CI: 14.83–23.30; p < 0.001). Emotional and informational support also increased significantly, although with smaller effect sizes. Conclusion and Recommendations: The Ambu Binangkit model was effective in improving maternal support for children’s menstrual health through a contextual sociocultural approach within the primary school setting. This model has the potential to be developed as a family-based intervention strategy to improve menstrual health from primary school age. Its implementation should be strengthened through integration with school programs and health services to ensure sustainability and broader impact. Keywords: menstrual health, maternal support, sociocultural, Ambu Binangkit, primary school.