Those who do not understand the clear meaning of “natural born citizen” are the same people who do not understand “shall not be infringed”, neither need defining for the clear-thinking.
They do not want them understood as clearly as they are written.
4 Supreme Court Cases define “natural born citizen”: https://www.thepostemail.com/2009/10/18/4-supreme-court-cases-define-natural-born-citizen/
For those that would like to read online some of Vattel’s writings on kinds of citizenship see: https://lonang.com/library/reference/vattel-law-of-nations/vatt-119/