Introduction: Breastfeeding self-efficacy and infant feeding attitudes had shown as predictors in determining the successfulness of breastfeeding. Maternal obesity is commonly linked to poor breastfeeding outcomes. However, studies on factors influencing breastfeeding self-efficacy and infant feeding attitudes among overweight and obese mothers in Malaysia were still limited. Therefore, this study aimed to investigate determinants of breastfeeding self-ef- ficacy and infant feeding attitudes among overweight and obese pregnant mothers. Methods: About 200 expecting mothers were recruited in this cross-sectional study using convenience sampling. Breastfeeding Self-Efficacy Short Form (BSES-SF) and IOWA Infant Feeding questionnaires were used as study instruments. Simple and multiple logis- tic regressions were deployed to analyze the determinants of breastfeeding self-efficacy and infant feeding attitudes among overweight and obese pregnant mothers. Results:Majority of the mothers had breastfeeding experience (71.5 %; n=143), received breastfeeding support (92.5%; n = 185) and 30.5% (n = 61) had attended antenatal class. Obese mothers had lower mean score for breastfeeding self-efficacy (51.92±12.07) and infant feeding attitudes (62.56±8.02) compared to normal-weight mothers (54.56±9.80, 63.28 ± 6.748). Breastfeeding experience and maternal age were significantly associated with breastfeeding self-efficacy and infant feeding attitudes (p<0.05). Conclusion: Breastfeed- ing experience and maternal age were important factors that influence breastfeeding self-efficacy and infant feeding attitudes among overweight and obese mothers. Future interventions needed to be implemented to improve breast- feeding rates targeting this population, given that they were least likely to have a successful breastfeeding.