Initially, there was little data on the safety of immunization against COVID-19 infection in pregnant women. However, previous studies revealed no safety concerns for pregnant women or newborns who received an mRNA COVID-19 vaccine during pregnancy. Therefore, this study aimed to investigate the effects of COVID-19 vaccination on perinatal outcomes. Methods: This cross-sectional study. It started from January 2022 to June 2022. The questionnaire was developed and validated by experts. This study included all women admitted to the postpartum ward who were more than 18 years old and had received the COVID-19 vaccine. The study excluded women without proof of their vaccination status or who could not complete the questionnaire. The primary outcome was the effect of COVID-19 vaccination on gestational age and birth weight. Results: A total of 365 participants. The mean gestational age of the unvaccinated women was 38.83 ± 1.62 weeks (p < 0.001), higher than that of vaccinated women (37.69 ± 2.9 weeks). However, the average birth weight for the unvaccinated women was 2.96 ± 0.4 kg (p = 0.89) and for vaccinated women (2.97 ± 0.66 kg). Conclusion: COVID-19 vaccination, regardless of the type of vaccine received before, during, or after pregnancy, is not associated with any unfavorable perinatal outcomes.