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ELI5: What happens to the cervix during labor and childbirth?
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I have never been and likely will never be pregnant, but I'm unclear on how the cervix can dilate to 10 cm.
I always assumed the os (the small opening in the cervix) is what dilates and what the baby passes through. But that seems physiologically impossible, given that a normal cervix is only about 2.5 cm across.
I know that "effacement" is also something that happens, but I don't know how that relates to dilation. Can someone please walk me through it? Thanks!
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