You mean this definition:
nat·u·ral-born
adjective
adjective: natural-born
having a specified innate characteristic or ability.
Notice the word innate?
Arab and Iranian men shop for western wives. There are a lot of US citizen females currently living in Iran married to Iranian men. Are their children also Natural Born Citizens of the USA? Does simply having an American citizen parent make one a NBC of the USA? Interesting topic, I will follow it closely.