INTRODUCTION: The process of breast milk production is not normally dependent on nutrition. However, optimal nutrition can have a positive effect on the health of breastfeeding women and their infants. Traditions and cultural beliefs have a significant impact on the nutrition of breastfeeding women. Popular myths often present barriers that can lead to dietary restrictions and potentially have undesirable effects. OBJECTIVE: The aim of this study was to determine the dietary habits of breastfeeding women. MATERIALS AND METHODS: The study included 208 breastfeeding women from Croatia whose children were less than six months old at the time of the study. Data were collected using an anonymous online questionnaire “Dietary Habits of breastfeeding women“, which was published on the social network of a breastfeeding group. RESULTS: The results showed that the majority of breastfeeding women avoided certain foods (66.3%). The most frequently avoided foods are legumes (40.4%). Breastfeeding women in Istria, on the Croatian coast and in Dalmatia most often avoid legumes (36.7%) and cabbage (36.7%), in Slavonia and Baranya legumes (43.8%) and in Northern and Central Croatia also legumes (42.3%). The majority of breastfeeding women (62%) use certain foods to increase breast milk production. Breastfeeding women most often consume higher fluid intake to increase breast milk production (50.5%). In all three regions, breastfeeding women are most likely to increase their fluid intake to increase breast milk production (Istria, Croatian coast and Dalmatia (54.4%), Slavonia and Baranya (53.1%) and Northern and Central Croatia (46.4%)). CONCLUSION: The results of this study provide a better insight into the dietary habits of breastfeeding women. Determining the dietary habits and identifying deficits in the nutritional intake of breastfeeding women can contribute to the development of targeted interventions such as education and counselling of breastfeeding mothers and remove existing barriers to optimal nutrition.