So I suggest you take a page from slam poets and get into repetition. Choose words or phrases that have birdsounds to repeat. Read it aloud as you change and you will feel where you need to bird sing. When you think you've got it, have someone else read it aloud to you to see if your meaning still comes through. Still the eggs shatter early.
Nothing changes that.
So anyway, Esther, I thank you for putting this poem out there. Moves away from this spine seem to me to be in the wrong direction. The hand-wringing on the speaker's part that they are not to blame comes under this rubric. It also introduces a tone of melodrama and self-pity that is unnecessary considering the strength of the opening images. I think the move to the speaker's offspring at the end is a great move and Esther should not question it.