Article Two, Section 1 of the United States Constitution sets forth the eligibility requirements for serving as President of the United States:
No person except a natural born Citizen, or a Citizen of the United States, at the time of the Adoption of this Constitution, shall be eligible to the Office of President; neither shall any Person be eligible to that Office who shall not have attained to the Age of thirty-five Years, and been fourteen Years a Resident within the United States.
OK, I see what you are saying. It does not define natural born.
By the way- Isn’t everyone “natural born”?? In the history of man has anyone ever been unnaturally born? Maybe test tube babies?