the information provided is just to the best of my knowledge, for reference only.
taking care of a us-borned baby is not a sufficient reason that you can get a residency in the states. when your baby gets to 18yrs old, he/she can apply you to the states.
i think you'd better consult an immigration lawyer about your case.
in sf, nursery runs from 600-1500per month for 11-12payments per annum. public school, i dont think you have to pay. but the public school in san francisco is not very good, you better check them out before deciding to bring your kid back.