Parents don’t need to be natural born citizens for the child to be a natural born citizen, the parents must be citizens at the time of the child’s birth in the US.
Ackshully, I went back and re-read my post and realized I left something open that needs to be clarified.
One, if the Birthers are right that Obama is either a) a dual-national born in Mombasa to a woman too young to confer US native-citizen status by herself, or b) not who his parents said he is (the newer "baby-switch" theory that I discount, or better, simply can't believe), then Obama has an NBC problem/disability from birth.
Two, and however, I think his paperwork in Hawaii isn't really the problem. It's what he and his mother did after they returned from Jakarta, after Lolo Soetoro and Ann Dunham Sutoro (notice she spelled it differently -- she kept the name for the rest of her life) had divorced.
Assuming arguendo that Baby Bozo NBC at birth, nevertheless he moved to Indonesia and became an Indonesian citizen by an act of his step-father and by Indonesian law (which does not recognize dual citizenship at all). Now, Lolo Soetoro et ux could not alienate the boy on their own initiative, and when Ann brought the family back to Hawaii, she could execute forms at the State Department office nearest her to "renaturalize" the boy and surrender his Indonesian passport and documents. We don't know if she did that.
It doesn't help that lawyers have been arguing 'em round and arguing 'em flat for 200 years now.
Here is a link to an article at Redstate, where a blogger comments on the Birther problem, and he appears to favor letting Barky get away with everything .....
Note especially how, in the case of Lynch vs. Clarke (and Lynch), 1844, if you invert the logic of Mr. Clarke's attorney, that of course Miss Lynch was a U.S. citizen by the positive law of the United States (or by its common law, I'm not sure which he's arguing), then therefore she was obviously a U.S. citizen, then, mutatis mutandis as Bill Buckley used to like to say, by British law the opposite was true on the same set of facts. How 'bout dat??