Objectives: The main objective of the paper was to examine the relationship between breastfeeding duration and the activity of “Baby-Friendly“ Hospital. Specific objectives of the thesis were: to examine the relation between breastfeeding duration and skin-to-skin contact, the time of first feeding, mother's stay with the baby during the first 24 hours, the satisfaction of provided information at hospital, sociodemographic characteristics, type of delivery completion, and taking infant milk formula preparations at hospital. Additional survey objectives were to examine the relation between breastfeeding duration and pregnancy course attendance as well as attendance to a breastfeeding support group. Data Subjects and Methods: A total of 134 data subjects participated the survey. Data subjects were women who were breastfeeding and had children under 3 years. The survey was conducted in two different regions: Primorje-Gorski Kotar and Bjelovar-Bilogora counties. In the Bjelovar-Bilogora County participated 100 data subjects, and in the Primorje-Gorski Kotar County participated 34 dana subjects. A survey questionnaire was used as a research instrument. The data collected were statistically processed using the statistical program Statistica (Dell Inc, USA). Basic descriptive measures of frequency, number and percentage were used for data presentation purposes. For the purpose of examining the relations and differences between variables on the questionnaire used, hi-square tests were used with Yates correction in cases when the frequency within the cell was less than 5. The significance level was set at p <0.005. Results: The results of the analysis show that the duration of breastfeeding is not statistically significantly related to the time elapsed from birth to skin-to-skin contact and first breastfeeding, stay of the mother and child in the same room 24 hours after birth, mother’s participation in the pregnancy course, type of delivery and satisfaction of information on breastfeeding provided at hospital. Mothers who did not participate in the breastfeeding support group were statistically significantly more likely to breastfeed for up to 6 months (46%) compared to mothers who were 45 participating to the breastfeeding support group (13%). That is, mothers who have been participating the breastfeeding support course - breastfeed their baby longer. For more than a year have been breastfeed infants who have not been taking any formula milk preparations at hospital (46%) compared to the infants who were taking formula milk preparations from time to time (39%) and children taking formula milk preparations at hospital (19%). Almost half of the mothers (48%) who got information from the nurse at hospital about the importance of breastfeeding – chose to breastfeed their infants for 12 months, while mothers with the attitude that breastfeeding is necessary, are also more likely to breastfeed for more than a year than other mothers. Conclusion: The results of the survey showed that there was no statistically significant correlation between breastfeeding duration and skin-to-skin stimulation, the time of first breastfeeding, mother's stay with the baby within the first 24 hours, sociodemographic characteristics, way of delivery completion, satisfaction with the information provided at hospital and attendance to pregnant women courses. It is statistically significant that breastfeeding duration is related to the participating of breastfeeding support groups, information provided at hospital by nurses about the importance of breastfeeding, one's own attitude toward breastfeeding and not taking formula milk preparations at hospital.