What is the meaning of Before birth one her children in Anne Poem?

The line "Before birth one her children" in Anne Sexton's poem "Wanting To Die" does not mean that she wants to die because she has to give birth.

The poem is a reflection of Sexton's battle with depression and suicidal thoughts due to her miscarriage and mental illness. In metaphorical terms, the author expresses a desire for nonexistence, to be like a stone or a plant. It is a profound expression of existential despair.