The aim of this study was to investigate the effects of educational message tailoring on pregnant women’s self-efficacy, perceived social support, and intention to choose normal vaginal delivery. Study population consisted of pregnant women who, in 2016, referred to Shahid Avval and Shahid Navvab Safavi community health centers, Isfahan, Iran, for attending prenatal education classes. The main inclusion criteria were a gestational age of 20–25 weeks and no contraindication for normal vaginal delivery while the main exclusion criterion was inability or unwillingness to stay in the study. Women were randomly allocated to a control and an intervention group. Primarily, all women in both groups completed study questionnaires in the first session of the study intervention held in the 20th–25th weeks of their pregnancy. Then, women in the intervention group were provided with a CD containing tailored educational messages on pregnancy and delivery. Messages were provided through PowerPoint presentation files. Women in the control group received no tailored educational messages on pregnancy and delivery. All women in both groups received routine prenatal educations. Women re-completed study questionnaires at the end of the last prenatal education class which coincided with the 37th week of their pregnancy. The time interval between pretest and posttest was four months. The primary outcome was improvements in the knowledge, attitude, self-efficacy, and perceived social support for selecting normal vaginal delivery.