If you recognize that there is such a thing as an “anchor baby,” a child born in the United States to illegal aliens, then you recognize that just being born here is enough to make you natural born.
A) The SCOTUS definition of NBC is self-limiting. "These are the natives, or natural-born citizens, as distinguished from aliens or foreigners." IOW, if you are not born in the country to citizen parents, you are considered a natural alien whose claim to U.S. citizenship is in doubt and must be resolved by either constitutional or statutory means.
B) In U.S. v Wong Kim Ark, the court ruled that to be satisfy the subject clause, the parents must have permanent residence and domicil.
If there's such a thing as an "anchor baby," it is the result of a misapplication of statutory law and has nothing to do with natural-born citizenship.
"Birth" is a natural process. The founders weren't using the term "natural born" in such a simplistic meaning.