This is something that parents are informed about back in 'Kintergarden Roundup", held between January and March every year. The schools make sure to tell them that they need to bring Official State Certificates to present to the school. Schools even provide applications for the parents to fill out and mail in with payment for the Official State Certificate.
Not the hospital copy. Not the County copy. the Official, State-Certified, Raised-Seal copy of the record on file at the Dept. of Vital Registration. Everyone with me so far?
So why do so many dumbfucks wind up crawling into our office the VERY DAMN DAY school starts whining about "the school won't let my child stay unless we give them a birth certificate".
These parents bitch, whine, and moan AT ME, because the school told them the county copy that the parents spent five to ten dollars on with its fancy shiny gold seal wasn't good enough. 
And even worse, these parents can't take the time to drop by themselves, so they send a relative.. such as a Cousin, or the childs Aunt or Uncle. StateLaw sez: ONLY IMMEDIATE FAMILY SUCH AS PARENTS OR GRANDPARENTS CAN PICK UP A CERTIFICATE.
So what happens then? I get bitched out by the AUNT!
Now.. is it *REALLY* that hard to listen to what the school tells you to do and get it right the First Fuckin' time?
Then when they come in and start bitching, tell them to STFU and read the sign. 
