Iranian Journal of Nursing and Midwifery Research1735-906631320260729455461ENDepartment of Nursing, Universitas Respati Yogyakarta, Indonesia,Vocational School, Universitas Sebelas Maret, Surakarta, Indonesia,Department of Nursing, Ministry of Health Polytechnic of Sorong, Southwest Papua, Indonesia,Department of Nursing, Universitas Respati Yogyakarta, Indonesia,Universitas Madani, Yogyakarta, IndonesiaUniversitas Katolik Indonesia Santo Paulus Ruteng, East Nusa Tenggara, IndonesiDepartment of Nursing, Ministry of Health Polytechnic of Sorong, Southwest Papua, Indonesia,2026072820260728<p><strong>Background: </strong>Maternal decision‑making regarding the use of infant formula milk in Indonesia is shaped by a complex interplay of social, economic, and informational factors. This study aimed to elucidate the determinants of mothers’ choices when selecting formula milk in Sorong City, Indonesia, addressing gaps in previous research that overlooked the role of digital media and microeconomic factors in maternal decision‑making. <strong>Materials and Methods: </strong>This study employed a cross‑sectional observational design and was conducted from January to June 2024. A cohort of 180 mothers with children aged 0–24 months was selected using stratified random sampling. Data were collected using the Maternal Infant Nutrition Questionnaire (MIN‑Q). Multivariate logistic regression analysis was performed to identify the significant factors contributing to the decision to use formula milk. <strong>Results: </strong>The findings indicated that most respondents [88 (48.90%)] exclusively used formula milk, while 92 (51.10%) adopted a mixed feeding pattern. Logistic regression analysis revealed that the use of digital media for nutritional information was significantly associated with formula milk use (β = 0.21, <em>P </em>= 0.022), as were microeconomic factors such as savings or financial assistance (β = 0.18, <em>P </em>= 0.035). <strong>Conclusions: </strong>These findings highlight the need for government‑led interventions, including digital literacy programs and targeted financial subsidies for low‑income breastfeeding mothers, to promote exclusive breastfeeding. Therefore, credible digital education programs and more stringent regulations on formula milk </p>http://ijnmr.mui.ac.ir/index.php/ijnmr/article/view/2394http://ijnmr.mui.ac.ir/index.php/ijnmr/article/download/2394/70707982