Jump straight up as high as you can after the squat position, holding your arms up directly over your head.

在蹲起后，尽可能地向上跳，把你的手臂举过头顶。

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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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You can also try changing your position: Get up on all fours, or squat; the force of gravity might shift the baby's head.

你也可以尝试改变你的姿势：起床四肢着地，或者蹲着；让重力作用在婴儿的头部。

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After all the talk over the Wales tight-head position in the build-up, there were only a handful of scrums in the first half-hour.

BBC: Wales 12-19 New Zealand