So just to confirm:
Women having access to abortion = public health issue
Women having access to prenatal care = not a public health issue
Women's babies = not a part of the public
Is my understanding correct?
Public health typically refers to situations where the health of a large group of people as a whole is at stake. Whether this is COVID, bad meat, a radioactive spill, so on and so forth, makes no difference as long as it affects a large group of people in an open, public area.
Women having access to abortions can be considered a public health issue as the lack of such care affects women as a whole, but honestly that's more of a general health issue, as groups of women don't go and have abortions in the middle of a public space.
Prenatal care has the same response as above.
If a baby is taken into the public, then it becomes part of the public, if we're looking at this literally, but the real answer is that while the baby's foray into the public is irrelevant, it's also of no business to anyone else outside the select few that care for it.
Let me ask you this as a rebuttal: if you believe having a baby, and any abortion that may be considered with it, is a public health issue, then why is the care of the baby before and after birth not a public health issue as well? At what point is it feasible to reason that the birth of a child is the only part of that child's life that deserves to be at the concern of the general public?