This allows the mother to "safely lift the infant towards her and clear its breath passage soon after the birth", the scientists explained in the paper.

这使得母亲可以“在出生后不久安全地将新生儿举向自己，并清洁它的呼吸道”，科学家们在文章中解释道。

youdao

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。

youdao

The whole process related to a woman's giving birth is a "rite of passage", which plays an important part in the role transition of a woman in this special period.

生育过程是一种“通过仪式”，这个仪式对于这一时期女性的角色转变起到重要作用。

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After hours of unsuccessful labor and not knowing how to perform a cesarean, the doctors used a scalpel to sever the baby inside the woman's birth passage.

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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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In 2011 the Transgender Law Center successfully pushed for passage of legislation ending surgery as a requirement to obtain a new birth certificate in California.

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