<![CDATA[Background: Stunting is a chronic growth disorder influenced by maternal nutritional status, recurrent infections, and suboptimal caregiving practices. Strengthening maternal behavioral competence is an important strategy for stunting prevention, particularly through digital interventions. Objective: This study evaluated the effectiveness of the Si NaNing mobile application developed in this study in improving responsibility, autonomy, initiative, and self - control among pregnant women. Methods: The study was conducted in community health centers and midwife private practices (MPP) in Tanjungpinang from October to November 2025 using a quasi-experimental pre-test–post-test design with a control group. A total of 200 pregnant women were selected through consecutive sampling from a population of approximately 450 pregnant women and equally assigned into intervention and control groups (n = 100 each). Both groups received a 45 - minute health education session on stunting prevention delivered by trained midwives, while the intervention group additionally received full access to the Si NaNing application. Data were collected using a validated questionnaire at baseline and seven days post-intervention. Results: Significant improvements were found in all behavioral variables in the intervention group compared with the control group (p < 0.05). Regression analysis showed a very strong effect of the intervention, with R² values ranging from 0.960 to 0.986. Conclusion: These findings indicate that the Si NaNing application effectively strengthened maternal behavioral competencies related to stunting prevention and may serve as a promising digital educational approach for pregnant women.]]>
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