Objective: The aim of this study was to evaluate attitudes and knowledge regarding the oral health and infant oral health among pregnant women. Materials and methods: The questionnaire was anonymous and contained 27 questions about general demographic information, their own experiences about the oral health during pregnancy, the attitudes about the association between the oral health and pregnancy and the infant oral health. Results: The study involved 325 pregnant women, 18 to 43 years old. They are most informed about the linkage between the oral health and pregnancy from their dentists (53.54%) and least from their general doctors (4%). Multiple regression analyses showed that the final attitude of pregnant women on the association between oral health and pregnancy was statistically significantly dependent on information via television or the Internet (β = 0.536, P = 0.008), and the final attitude on the infant oral health on information from books, magazines and brochures (β = 0.403, P = 0.049). In pregnancy, gingival bleeding was observed by 52.31% of respondents and tooth mobility by 12.31%. The chi-square test found that there was a difference in attitude regarding the age at which they should stop breastfeeding between respondents who had their first pregnancy and those who already had children. Only 9.23 % of respondents are aware that breastfeeding can cause tooth decay. Conclusion: Based on the results of this study, it was concluded that pregnant women in the Republic of Croatia are not sufficiently aware of oral health in pregnancy and infant oral health.