And what exactly makes it not valid? It isn't invalid just because you, or some internet crackpot, says it is.
"Incidently, since his father was a british subject, at the time of his birth and his mother was too young to confer citizenship; Obama is a british subject."
At the time of his birth he apparently was, but it doesn't matter. What matters is that he was born a US citizen.
It was not valid because it didn’t have a doctor’s signature
on it.
It was not valid because it didn’t have a doctor’s signature
on it. All Obama has to do is present a valid birth certificate to put this uncertainty to rest.