American Citizenship cannot be conferred upon a baby whose parents are citizens of another country.
Think of this way. Mom and Dad, from say, Paris, France come to Disneyland in Los Angeles. While they are here, on vacation, the very pregnant, French Mom goes into labor.
Well the smart thing to do is get to a hospital. So they do, cuz they are smart(they are French after all).
So while the smart, French, pregnant woman is in the hospital she gives birth. We can say it is a boy for the purpose of this discussion.
Anyway, out pops this kid, thing, with ten fingers and ten toes. Perfect. Except now the vacation is over and the newly minted French Mom and Dad have to go home. This live in the Montmartre District of Paris and can't wait to get home and have their baby blessed and baptized, at a little church called Sacré Coeur.
This beautiful white church is just a couple of blocks up from them and sits on a hill overlooking Paris. It will be a beautiful, momentous and joyous occasion.
So they leave the next day on board a British Airways flight so the French Mom can lay down on a bed for the overnight flight and be comfortable.
The French Mom and French Dad, arrive at de Gaulle International and the immigration and customs people, of France ask for the passport of the French Mom and French Dad.
They ask if the French Mom and French Dad have anything to declare and ....
So what nationality is the child?
You and I are on the same page, I think, in the belief that the 14th Amendment ought not be used to naturalize so-called anchor babies. The 14th Amendment excludes “persons born in the United States who are foreigners”. I believe that meets the criteria of your example. Ergo, the child is exclusively French. Agree?