you did not answer the question - dry foot is an administrative not legal term
being born on the soil, as per American law, allows the baby native born citizenship. of course, since the baby’s parents are both citizens of mexico (for example), the baby would also be able to claim mexican citizenship
therefore, the baby can be a citizen of TWO countries
this would make the kid a native born American... but not natural born
a natural born citizen is one that is a citizen naturally... AS THERE ARE NO ALTERNATIVES