Whereas the bottom of the pelvis (the outlet) has more space front to back. The top (brim) of the pelvis very commonly is wider side to side, and narrower front to back. The reason they need to do this is firstly that the pelvis is not a round shape, but more oval. I just think that it’s really interesting to know about them (but then as a birth geek I would!!), and I think that it really helps parents to be understand why moving in labour and not being stuck lying on a bed is hugely important. It’s not that you’ll feel each one, or that you need to know when baby is doing them in your labour - don’t worry about that. The whole series of rotational movements that babies make to travel through the pelvis in labour are called ‘Cardinal movement’. For the mother it’s all about allowing it to happen by being free to move your body in labour (which is why we talk about active birth and biomechanics on my Antenatal & Hypnobirthing Courses). Babies know how to do this, it’s a blueprint that’s built in - they will try their best to move and shift into a position inside the womb that facilitates their birth. It allows the smallest part of the baby (the crown/top of the head) to present first and then for baby to travel through the depth of the pelvis perfectly. How great is that? As well as being very cool and clever, this movement is all about baby being in a suitable position for birth to proceed physiologically.
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