Infant and toddler mortality is a global issue and one of the targets of the Sustainable Development Goals (SDGs). Mothers and children are family members who should be prioritized in healthcare services. The national coverage of healthcare services for infants, toddlers, and preschool children remains low at 69.9%. Posyandu (Integrated Health Post) is a community-based maternal and child healthcare service (UKBM) organized by and for the community to reduce maternal and child mortality rates. The coverage of mothers with toddlers visiting Posyandu Melati in Kuta Alam District, Banda Aceh City, is only 31.38%, far below the national strategic plan target of 70%. Objective: To determine the relationship between knowledge, attitude, and family support with maternal visits to Posyandu Melati in Kuta Alam District, Banda Aceh City. Research Method: This study used an analytical research design with a cross-sectional approach. The sampling technique employed probability sampling using systematic sampling, with a total of 58 mothers with toddlers. The research instruments included a questionnaire and the Maternal and Child Health (KIA) book. The study was conducted from July 11 to July 13, 2023, at Posyandu Melati, Kuta Alam District, Banda Aceh City. Data processing involved editing, coding, data entry, tabulating, and univariate and bivariate analysis. Research Results: Univariate analysis showed that the majority of respondents had good knowledge (23 respondents, 39.7%), received supportive family support (35 respondents, 60.3%), and had irregular Posyandu visits (30 respondents, 51.7%). Bivariate analysis revealed significant relationship between knowledge (p-value = 0.030), attitude (p-value = 0.015), and family support (p-value = 0.013) with maternal visits to Posyandu. Conclusion and Recommendations: There is a significant relationship between knowledge, attitude, and family/husband support with maternal visits to Posyandu Melati in Kuta Alam District, Banda Aceh City. Healthcare workers should continue providing education and counseling on the benefits of Posyandu in maintaining maternal and child health.