摘要
Background： Although increasing parity increased the risk of pregnancy complications and despite of Vietnam’s family planning policy of two-child, the percent of women having three or more children has tended for five years. Objectives： （1） Find out the prevalence of parity ≥ 3 and their reasons at Haiphong Hospital of Obstetrics and Gynecology in 2016; （2） Describe the methods of labor and its adverse outcomes. Materials and methods： A cross-sectional in 485 women had delivered three or more infants at Haiphong Hospital of Obstetrics and Gynecology from June to August, 2016. Results： The prevalence of parity ≥ 3 is 11.9%, no relation to geopraphy, education and career. The main reasons are unplanned pregnancy and desire to have a baby boy. The sex ratio at birth is 162. The proportion of cesarean delivery is 53.4%, in which is due to an old C-section. Conclusion： serious gender is imbalance among women having three or more baby （162 baby boys per hundred baby girls）.
