Before the Birth of One of Her Children
Death's parting blow
Bradstreet uses violent language—death doesn't separate, it strikes. The physical brutality matches her fear of childbirth mortality.
That knot's untied
Marriage metaphor: they became 'one flesh' at the wedding, so her death will undo that knot. She'll be 'none'—literally nobody.
Half my days
Psalm 90 reference—'threescore years and ten' is the biblical lifespan. She's doing mortality math, calculating what she'll miss.
Step-dame's injury
Step-mother. If her husband remarries, she wants him to protect their children from a potentially cruel replacement wife.
Absent hearse
The poem becomes her body—he'll honor her 'absent hearse' by reading it. The paper is a stand-in for her corpse.