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过期妊娠以超过42周以上(>294天)计算,但需要注意月经周期、哺乳情况、胎儿大小、胎心和胎动的时间等,以校正预产期。过期妊娠增加围产期死亡率和新生儿发病率。手术产的发生率较足月妊娠增加2～5倍,中产钳术及剖腹产术皆2～3倍于足月妊娠。过期妊娠的胎儿出生体重可至4,000克以上,但也可能由于胎盘功能不全而胎儿体重并不增加反而减少。据统对武汉市3年内新生儿死亡率中,由于过期的妊娠所致新生儿死亡率为17.08％,仅次于妊娠中毒症,占第二位。由于胎盘老化,功能日益低下,而胎儿对氧的需要却随妊娠期增加,妊娠43周后胎盘供氧明显减少,脐静脉
Overdue pregnancies are calculated over 42 weeks (> 294 days), but the menstrual cycle, breastfeeding status, fetal size, fetal heart rate and time of fetal movement should be taken into account to correct for the expected date of delivery. Expired pregnancy increases perinatal mortality and neonatal morbidity. The incidence of surgical production increased 2 to 5 times more than full-term pregnancy, middle-class forceps and caesarean section are 2 to 3 times the full-term pregnancy. Fetal birth weight of overdue pregnancies may reach over 4,000 grams, but may also be reduced due to placental insufficiency without increasing body weight. According to the statistics of the 3-year neonatal mortality rate in Wuhan, the neonatal mortality rate due to outdated pregnancy was 17.08%, second only to pregnancy poisoning, accounting for the second place. Due to the aging of the placenta, the function is getting lower and lower, and the need of the fetus for oxygen increases with that of the placenta. The oxygen supply to the placenta is obviously reduced after 43 weeks of gestation, and the umbilical vein