Background: Senses of Birth (SoB) is a health education intervention in Brazil that addresses reproductive rights, the benefits and risks of normal birth and cesarean, and use of evidence-based practices (EBP) during labor and childbirth, aiming to reduce unnecessary cesareans in the country. This study evaluates the impact of the SoB intervention on pregnant women's perceived knowledge about normal birth, cesarean, and use of EBP in childbirth. Method: 1,287 pregnant women answered a structured questionnaire, immediately after their visit to the exhibition, between March 2015 and March 2016, in four cities. To identify the impact of the intervention on women's perceived knowledge and possible association with socioeconomic and demographic characteristics, statistical analyses were performed including paired T-tests, ANOVA, and logistic and linear regressions. Results: The mean score (MS) of perceived knowledge after the intervention was higher than the mean score before experiencing the SoB for all three knowledge domains: Normal Birth (MS Before= 3.71 x MS After= 4.49), Cesarean (MS Before= 3.54 x MS After= 4.26) and EBPs (MS Before= 3.14 x MS After= 4.14). The results suggest that SoB intervention was more effective for low income women (B = 0.206; p < 0.001 for EBP), women without private health insurance (OR 2.47, 95% CI: 1.49-4.09 for normal birth), women with private prenatal care (OR 2.42, 95% CI: 1.59-3.66 for normal birth), women experiencing their first pregnancy (OR 1.92, 95% CI: 1.31-2.82 for EBP; OR 1.37, 95% CI: 1.03-1.84 for normal birth; OR 1.37, 95% CI: 1.03-1.84 for cesarean), and women in their first or second trimester at the time of the intervention (OR 1.64, 95% CI: 1.13-2.39 for EBP; OR 1.48, 95% CI: 1.11-1.97 for normal birth; OR 1.85, 95% CI: 1.40-2.41 for cesarean). Conclusion: The study showed opportunities to increase knowledge among Brazilian pregnant women for the three knowledge domains, and a need to focus the discussion on how to achieve a positive experience of birth using EBP. The intervention gains relevance considering the lack of evidence of the efficacy of non-clinical interventions to reduce unnecessary cesareans in middle and low-income countries targeting women.