Foreign parents do not have "natural born" citizen children.... It is possible if born in the U.S. that they are citizens, but NOT "natural born" U.S. Citizens....
Oh, I just noticed. You said foreigner's natural-born child. The child can be natural-born, but not a natural-born citizen. It requires citizen parents to be that.
Don't argue with me, argue with the judge who called "the children are natural-born citizens of the United States" a "relevant fact."