Because it produces no radiation, ultrasound is sometimes used during pregnancy to determine the size and position of the fetus.
由于无放射性，超声波有时被用于妊娠期的妇女，以确定胎儿的位置及大小。
The main causes in sequence were abnormal position of the fetus, asphyxia, monstrum, premature labor, and pathological pregnancy.
围产儿主要死因顺序为胎位异常，窒息，畸形，早产和病理妊娠等。
Technically, back labor occurs when the fetus is in a posterior position, with its face up and the back of its head pressing against your sacrum, or the back of your pelvis.
从技术上来说，背阵痛发生在胎儿处于背对的位置，它的脸朝上而后脑勺紧靠你的骶骨或者骨盆后方。
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