Introduction: Even though vaccination is considered as one of the major accomplishments of public health, a decline in vaccination coverage rates has been observed globally in recent years. One of the common causes of vaccine hesitancy is getting information from unreliable sources. Most parents make the decision about vaccination before the birth of a child, so pregnancy is the optimal period to support future parents in deciding to vaccinate their child. Objective: To examine the intention to vaccinate a child, attitudes towards childhood vaccination and sources of information about vaccination in pregnant women in the Republic of Croatia. Methods: A cross-sectional study was conducted on a convenient sample of 297 pregnant women, via an online questionnaire designed for this study. Results: Most respondents have a predominantly positive attitude towards childhood vaccination and over 80% of them intend to vaccinate their child with all mandatory vaccines. The attitude towards vaccination and the intention to vaccinate are moderately positively correlated. Pregnant women who have been vaccinated in pregnancy have a more positive attitude towards childhood vaccinations than those who have not been vaccinated. Pregnant women with a positive attitude towards childhood vaccinations are more likely to use professional sources and perceive them as more reliable than pregnant women with a negative attitude. Professional sources of information are equally often used by all pregnant women, but those who intend to vaccinate their child with all mandatory vaccines perceive them to be significantly more reliable than other pregnant women. Unprofessional sources are most often used and perceived most reliable by pregnant women who intend to vaccinate their child only with some vaccines. Popular-professional sources are least used by pregnant women who intend to vaccinate their children with all mandatory vaccines, but they consider them significantly more reliable than those who intend to refuse all vaccines. Conclusion: The results support the need to establish a system of providing professional support to pregnant women in deciding to vaccinate their child and directing them to reliable sources of information on vaccination.