四胎，某些为活产

定义

活产是指胎儿从母体内完全排出或取出，不论妊娠时间长短，胎儿在分离后显示出生命迹象。 死产是指妊娠满 22 周或更长时间内，胎儿在从母体完全排出或取出之前已经死亡。 死产不同于人工流产。 如果没有胎龄信息，则以出生体重500 克及以上作为标准。

Live birth is the complete expulsion or extraction from a woman of a fetus, irrespective of the duration of the pregnancy, which, after such separation, shows signs of life. Stillbirth is the complete expulsion or extraction from a woman of a fetus, following its death prior to the complete expulsion or extraction, at 22 or more completed weeks of gestation. Stillbirths are distinct from cases of induced abortion. When information on gestational age is unavailable use birthweight 500 grams and more as the criteria.

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• 四胎，某些为活产