Majority fetus head position unusually is persistent occipitoposterior position and persistent occipitotransverse position, can trying the delivery;

大多数胎头位置异常为持续性枕横位和枕后位，可以试产；

youdao

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。

youdao