Research Objectives:~Establish a prediction and scoring system for twin premature birth.~To investigate the curative effect of 200mg,400mg and 600mg of vaginal progesterone in the prevention of twin premature birth.~To investigate the effect of stress cervical ligation in preventing premature delivery of twins.~The optimal dose of atosiban for the treatment of twin premature birth.~The influence of delivery mode on twin premature infants under 32 weeks. It has now entered the second phase: clinical data collection
Research Objectives:~Establish a prediction and scoring system for twin premature birth.~To investigate the curative effect of 200mg,400mg and 600mg of vaginal progesterone in the prevention of twin premature birth.~To investigate the effect of stress cervical ligation in preventing premature delivery of twins.~The optimal dose of atosiban for the treatment of twin premature birth.~The influence of delivery mode on twin premature infants under 32 weeks.