妊娠20周以后，胎儿在子宫内死亡，称为死胎。由于大约半数的死胎案例妊娠时期根本没有任何征兆显示存在问题，所以多数父母是在完全没意识到的情况下丧失胎儿。胎儿死亡的两个星期之内一般能自然娩出，选择等待自然娩出对孕妇的健康没有多大的风险。如果孕妇选择等待自然娩出，但两周过后仍毫无动静，最好还是进行人工引产，因为时间长了有凝血的危险。
n. stillbirth
misc. stillborn foetus ; dead fetus
The indexes including fertilization,abortion,monster,stillbirth,number of filial mice in each brood and the weight during pregnancy were observed among groups.
观察小鼠是否受孕、流产、畸形、死胎、每窝仔鼠的数目及孕期增重情况等指标。
参考来源 - 奥卡西平对妊娠小鼠的不良影响及叶酸的干预作用Breeding value of a maximum of stillbirth: 0.1364; minimum: -0.0860.
死胎育种值最高为:0.1364;最低:-0.0860。
参考来源 - 母猪死胎和木乃伊的遗传参数估计及影响因素研究·2,447,543篇论文数据，部分数据来源于NoteExpress
但是，这一进程却因为两个原因猝死胎中。
But the process died almost as soon as it began, for two reasons.
对于五大死胎原因，死因推断诊断相对医院诊断的准确率为64%。
Overall diagnostic accuracy of verbal autopsy diagnosis versus hospital-based diagnosis for all five top causes of stillbirth was 64%.
这些妇女的怀孕期还可以能持续较长的时间——这就增加了死胎的风险。
These women were also more likely to have pregnancies that lasted longer - raising the risk of stillbirth.
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