Sure, it's constantly changing. Back when my grandmother was born, the birth records were kept by the church. For my mother, the town clerk entered it into the town records, when somebody told her it had happened. For me, the doctor signed the form, and the hospital sent it to the town clerk, who in turn issued a birth certificate to my folks, if they ask for it.
Turns out, because we lived in a small town with no hospital, my folks never bothered to go back to the town clerk where I was born, to get a birth certificate. The town clerk where we lived gave my mother a notarized form, when I was 5, so I could go to school. It probably wasn't strictly legal, but in a small town, where everyone knows everyone, it served the purpose. I used that same paper to get my SS card.
Flash forward 50odd years, the feds wouldn't buy that form from the town clerk where we lived, and demanded an original birth certificate from the town clerk where I was born. All I had to do was sign a consent form, and Boeing obtained the original birth certificate for me, satisfied the feds, then mailed it to me. So now I can run for president.
And when I'm king, I'm gonna slap half you fuckers up side the head.