The definition of the term, “natural born citizen”, was entered into the Congressional record of the House on March 9, 1866, in comments made by Rep. John Bingham on the Civil Rights Act of 1866, which was the precursor to the Fourteenth Amendment. He repeated Vattel’s definition when he said:
“[I] find no fault with the introductory clause, which is simply declaratory of what is written in the Constitution, that every human being born within the jurisdiction of the United States of parents not owing allegiance to any foreign sovereignty is, in the language of your Constitution itself, a natural born citizen. . . . ” — John A. Bingham , March 9, 1866 Cong. Globe, 39th, 1st Sess., (1866) [page 1291}
http://memory.loc.gov/cgi-bin/ampage?collId=llcg&fileName=071/llcg071.db&recNum=332
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So.....how many people does it take in your world to make a baby?
Entering that definition into the Congressional Record does not give it any elevated status, other than being able to use it as persuasive authority. It’s not binding.