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postterm pregnancy
Postmaturity is the condition of a baby that has not yet been born after 42 weeks of gestation, two weeks beyond the normal 40. Post-term, postmaturity, prolonged pregnancy, and post-dates pregnancy all refer to postmature birth. Post-mature births can carry risks for both the mother and the infant, including fetal malnutrition. After the 42nd week of gestation, the placenta, which supplies the baby with nutrients and oxygen from the mother, starts aging and will eventually fail. If the fetus passes its fecal matter, which is not typical until after birth, and the child breathes it in, then the baby could become sick with meconium aspiration syndrome. Postterm pregnancy may be a reason to induce labor.
==Causes==
The causes of post-term births are unknown, but post-mature births are more likely when the mother has experienced a previous post-mature birth. Due dates are easily miscalculated when the mother is unsure of her last menstrual period. When there is a miscalculation, the baby could be delivered before or after the expected due date.〔(【引用サイトリンク】title=Postmaturity )〕 Post-mature births can also be attributed to irregular menstrual cycles. When the menstrual period is irregular it is very difficult to judge when the ovaries would be available for fertilization and subsequently result in pregnancy. Some post-mature pregnancies are because the mother is not certain of her last period, so in reality the baby is not technically post-mature.〔 However in most countries where gestation is measured by ultrasound scan technology, this is less likely.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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