INTRODUCTION With the growing popularity of infertility treatments, the incidence of multiple pregnancies has increased, presenting remarkable challenges in high-risk obstetrics. For example, the rate of postpartum hemorrhage (singleton: 2%–3% vs. triplet: 9%), preeclampsia (singleton: 2% vs. triplet: 26%),1 and preterm birth are increased, and the odds ratio for the occurrence of these complications rises with increasing fetal number.