birth canal

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While your baby’s bones have mostly hardened by now, his skull will remain pliable until after birth to allow him to fit through the birth canal.
现在婴儿的骨骼几乎全部都硬化了，他的颅骨直到出生之后将仍保持柔韧，这让他适合通过产道。
Vernix caseosa a white cheesy substance has formed over the baby’s skin to protect it from its watery environment and to help ease her through the birth canal.
胎儿皮脂——白色的干酪质的物质——已经在婴儿表面形成了，它可以保护婴儿免受水环境的影响并帮助婴儿舒适地通过产道。
They found that baby braincases are similar in size and shape, regardless of their parentage. All are elongated, most likely to smooth passage through the birth canal.
结果发现，不论父母是尼安德特人还是现代人，其新生儿颅骨的形状大小都极其相似，都是拉长形的，这很可能是为能够顺利从产道出生而形成的。

When a baby's head is stuck in the birth canal for an extended period of time, it cuts off the blood supply to the woman's surrounding organs.
Access to a Caesarean section to relieve the pressure of obstructed labor is the most common way of preventing an unborn child from pressing so tightly in the birth canal that it cuts off blood flow to surrounding tissue.

One might conclude that this trait evolved to ease their passage through a narrow birth canal, but it seems to result from the way vertebrate skeletons develop.
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the part of the female body, starting from the uterus, that a baby travels through in order to be born naturally