By Maggie Nelson, from The Argonauts, out next month from Graywolf. Nelson is the author of several books, including Bluets, The Art of Cruelty: A Reckoning, and Jane: A Murder.

The task of the cervix is to stay closed, to make an impenetrable wall protecting the fetus, for approximately forty weeks of a pregnancy. After that, by means of labor, the wall must somehow become an opening. This happens through dilation, which is not a shattering, but an extreme thinning.

This feeling has its ontological merits, but it is not really a good feeling. It’s easy enough to stand…