"The Mother" is a poem about abortion in which the narrator laments her children "never made." While nurturing children, including feeding, is a central facet of motherhood, here the food imagery focuses on the feeding that is never done.
In the first stanza, the narrator uses the second person "you," gaining distance with that pronoun while addressing both herself and presumably other mothers who have aborted children for whatever reason. She speaks of the "sweet" (the candy or sugary treat) that she never had the chance to give them. In the last line of the stanza, she reverses the imagery, recognizing that children also repay the nurture of the mother with their presence. She mourns she will never "return for a snack of them, with gobbling mother eye." This refers to the way mothers often fall in love with their children and see them as the most adorable beings in the world.
In the second stanza, the narrator moves to the more personal first person voice and imagines feeding her unborn children: "I have eased/ my dim dears [imagined, ghostly children] at the breasts they could never suck."
The food imagery conveys a sense of loss and sadness at the simple, basic part of motherhood—physical nurturing—that has never been.