Aim: Intrauterine device (IUD) has a high effectivity of long-term contraception method. Post-placental IUD increases the number of contraception use and decreases the unmet need for contraception. The purposes of this study were to evaluate the effectivity, expulsion, acceptability, and side effects of post-placental IUD insertion using a clamp at Dr. Cipto Mangunkusumo National General Hospital. Materials and methods: This prospective longitudinal observational study was conducted at a tertiary teaching hospital (Dr. Cipto Mangunkusumo General Hospital, Jakarta, Indonesia) from April 2018 to March 2019. Post-placental IUD was inserted using a clamp. We interviewed the patients at 3 months and 6 months after insertion to evaluate the outcome. A total of 94 women were included in this study. Results: The effectivity was 100%. The expulsion rate was 2.13, 3.45, and 0% at 6 weeks, 3 months, and 6 months, respectively. The total acceptability rate at 6 weeks, 3 months, and 6 months was 96.81, 93.3, and 90.8%, respectively. Most of the subjects were satisfied with the IUD contraception at 3 months and 6 months. Conclusion: Post-placental IUD insertion using a clamp had good safety, effectivity, acceptance, and satisfaction. This data could be used for family planning counseling in daily practice. Post-placentaI IUD insertion should be routinely offered to all eligible postpartum women undergoing institutional deliveries.