OBJECTIVES: To assess postpartum women's contraceptive preferences and the impact of an educational intervention on these preferences, identifying factors motivating method choices. METHOD: This cross-sectional quantitative study included women within 48 h after delivery in a public Brazilian hospital. Participants were asked about their contraceptive preferences before and after an educational intervention, which aimed to inform women about the importance of early postpartum contraception, available methods, mechanisms of action, effectiveness, proper use, and side effects. A nursing professional explained contraceptives to postpartum women in individual sessions, demonstrating their use on simulators interactively for about 15 min. Statistical analyses were performed using JAMOVI version 2.3.28 and Microsoft Excel 2016. RESULTS: A total of 402 women (226 adolescents and 176 adults) were included. After the intervention, preference for long-acting reversible contraceptives (LARCs) increased significantly from 157 (39.1%) to 279 (68.7%) (P <
0.001). At the initial assessment, contraceptive preferences were injectable hormonal contraceptives (159 [39.6%]), intrauterine devices (IUDs) (109 [27.1%]), and implants (48 [11.9%]). After the educational intervention, IUDs became the most popular method, at 143 (35.6%), followed by implants (133 [33.1%]) and injectables (81 [20.1%]). Among adolescents, there was a significant increase in implant choice (P <
0.001) and a decrease in injectables and pills (P <
0.001
P = 0.006). Adults showed increased preference for implants (P <
0.001) and IUDs (P <
0.001), with a reduction in injectable hormonal contraceptives (P = 0.005) and tubal ligation (P = 0.006). CONCLUSION: An educational intervention during postpartum period can influence women's contraceptive choices. Timely education was associated with a significant increase in LARC preference.