Research Objective: To examine the frequency of use of formal and informal sources of information and their impact on the intended length of breastfeeding. Examine the difference in the intended length of breastfeeding according to sociodemographic factors. Subjects and Methods: A complete study was conducted among 139 nursing mothers who were under the care of Čakovec Health Centre. The survey was conducted via ananonymous survey in the form printed for this research. Results: Informal sources of information were used by those with highschool or a higher level of education, living in the city and who attended the breastfeeding support group. Formal sources of information were more frequently used by those who had taken part in the pregnancy course. There is no significant difference in the intended length of breastfeeding compared to the level of education, marital status, place of residence, family type or number of children. Regularly employed respondents are more likely to breastfeed for 6 to 12 months, and unemployed for more than one year. Patients who visited a nurse during pregnancy intended to breastfeed for more than a year. Conclusion: Formal sources of information are used more frequently and have an important role in the implementation of pregnancy and nursing education. The role of health care professionals, especially nurses, in promoting and improving breastfeeding is often crucial in deciding to start and continue breastfeeding. Nowadays, when information about breastfeeding is easily accessible via variousin formal sources (forums, web sites, social networks, etc.) it is important that communication between mothers and health care professionals is as good as possible to ensure quality care and the use of correct information.