Background: Knowledge, attitudes, and beliefs among young women to breast milk are still low. Aim: This study wanted to assess the effect of exclusive breastfeeding module on knowledge, attitudes, and beliefs of young women in the town of Tarakan. Method: Quantitative research with pre-posttest without control subjects were students of SMK Health Kaltara Tarakan with the number of samples (n=50) of respondents. Before the module manufacturing, the survey was conducted as drafting. Modules were in narrative form and were tested before correction by experts. Submission of exclusive breastfeeding module is done after pre-test for the measurement of knowledge, attitudes, and beliefs of young women against exclusive breastfeeding. The data were analyzed using the t-test. Results: Characteristics of respondents in general age was at 15-16 years (80%). The majority was among the first and second children (74%) and the number of siblings was between 2-3 years (54%.) Knowledge, attitudes, and beliefs after the intervention were 10.08 ± 0.85, the attitude was 29.64 ± 1.41, and confidence was 31.50 ± 1.31. It was statistically significant at p<0.05. Conclusions: Learning with exclusive breastfeeding module method can improve knowledge, attitudes, and beliefs of young women against exclusive breastfeeding in Tarakan.