对２９７例过期妊娠进行相关因素的研究，提示超过４２孕周娩出的新生儿平均体重仍有增加趋势。过期组平均体重（３３５８ｇ），较足月组（３０４８ｇ）高，差异显著。妊娠过期大多数胎儿无过熟危象，妊娠过期不表明胎儿过熟。我们认为，过期妊娠监测及处理时机事关重大 The study of 297 cases of overdue pregnancy related factors, suggesting that more than 42 gestational weeks the average weight of newborns still have an upward trend. The average body weight of the expired group (3358g), higher than the full-term group (3048g), the difference was significant. Outdated pregnancy Most fetuses without overripe crisis, pregnancy does not indicate that the fetus overdue. In our opinion, the timing of monitoring and handling of overdue pregnancies is of great importance