妊娠期超过42周（≥294天）出生的新生儿称为过期产儿（又称过熟儿）。多数过期产儿因胎盘功能尚正常，宫内生长发育良好，出生体重≥4000g称巨大儿，但有些婴儿胎盘明显老化，功能减退，导致胎儿营养障碍，生长发育停滞者，称胎盘功能不全综合征。由于胎儿在宫内慢性进行性缺氧和营养不良，消耗自身脂肪，出生体重可小于胎龄甚至低于2500g。
可是我还没有超过预产期，而且我觉得只有过期产儿才需要诱产。
But I'm not overdue yet and I thought induction was only for overdue babies.
妊娠41周虽然不是过期妊娠，但妊娠41周后分娩较足月分娩的围产儿死亡率明显增加。
Even 41 weeks gestation is not pregnancy prolongation, but the perinatal mortality rate of is higher in partus after 41 weeks gestation than in due partus.
妊娠周虽然不是过期妊娠，但妊娠周后分娩较足月分娩的围产儿死亡率明显增加。
Even weeks gestation is not pregnancy prolongation, but the perinatal mortality rate of is higher in partus after weeks gestation than in due partus.
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