That I was correct on the issue of birth tourism. It is illegal and not a legitimate purpose of a visit by an alien to the United States. (h/t CIS)
According to Customs and Border Protection:
Although there are no specific regulations prohibiting pregnant foreign nationals from entering the U.S., entry is allowed or denied at the discretion of the admitting U.S. Customs and Border Protection (CBP) Officer. If the CBP Officer determines that you are likely to become a ward of the government (meaning that the government must provide medical care because you do not have medical coverage while visiting the U.S.), you can be denied entry. When determining if you will be allowed to enter the U.S., CBP Officers take into consideration the date your child is due for delivery and the length of time you intend to stay in the U.S. In addition, they want evidence that you have sufficient medical insurance to cover any medical necessities while you are in the U.S. If it is determined that you do not have sufficient medical insurance to cover any unexpected or expected medical care while in the U.S., you can be denied entry. Additionally, if you are pregnant and entering the U.S. at a border port of entry via vehicle, be aware the radiation detection portals deployed at the ports do not emit any radiation, and do not present a hazard to you and your unborn child. Coming to the U.S. for the purpose of child birth is not a valid reason for travel.
Well, I told you so and I guess the hack former District Director of the legacy INS Thomas Schiltgen was wrong.