I don't think he was born in a hospital in Hawaii. I think he was born in Vancouver or White Rock Canada. I think his grandmother filed an affidavit of "at home birth" and that he doesn't have a normal original birth certificate.
I think his original birth record says he was born to Stanley Ann and Barack Obama I. I just don't think it lists a normal hospital birth.
I think it is a record which was filed by his Grandmother, not by a Hospital. He even admits in his book that it apparently wasn't good enough to prove Barack was his father.