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双胎妊娠35～36孕周或三胎及三胎以上妊娠34孕周时,产妇就应入院检查,确定所妊娠的胎儿数及胎龄。首先确诊第一胎儿约胎产式、胎方位及胎先露。若腹壁张力大或胎儿数查不清时,可用B超探测确定胎方位、胎盘附着位置及羊水量等。依据检查情况决定可否经阴道分娩。临产前检查血型及备血,并向家属交待可能发生的并发症等。胎龄满37周后,宫腔内压力较大,子宫体肌纤维延长并张力增大,子宫下段及宫颈肌纤维被动扩张,宫颈条件多数已趋于成熟(宫颈成熟度Bishop评分在7～8分以上),已具备分娩之良好条件。而且此时胎儿各重要器官已发育成熟,具备了各自独立的正常功能,可以实行计划分娩,我们主张在有准备的情况下,
Twin pregnancies 35 to 36 gestational weeks or third trimester and third trimester 34 weeks of gestation, the mothers should be hospitalized to determine the number of pregnancies and gestational age. First confirmed the first fetus about tire production, fetal position and fetal exposure. If the abdominal wall tension or the number of fetuses unclear, available B ultrasound detection of fetal position, placental attachment position and amniotic fluid volume. According to the inspection to decide whether vaginal delivery. Prenatal blood type and blood preparation, and confessed to the families of possible complications. 37 weeks after gestational age, intrauterine pressure is larger, the uterine muscle fiber is prolonged and tension is increased, and the lower uterine segment and cervical myofibers are expanded passively. Most cervical conditions have matured (Bishop score of cervical maturity is above 7 to 8 ), Already have good conditions of childbirth. And at this point all the important organs of the fetus have matured, have their own independent normal function, plan delivery can be implemented, we advocate in the case of preparation,