I got into a bit of a tizzy when I went to get my MD drivers license (no apostrophe, right?

)
I was born in a foreign country, with a birth certificate that is not well-received by American courts. I am an American citizen, with a passport, SS card, utility bills, et cetera.
The Maryland MVA website clearly stated that naturalized citizens
must provide their foreign birth certificate.
I gave them all the
other docs I had, and they didn't even bat an eyelid. No problems. Of course, they've since changed their policies to be much saner: Proof of ID, proof of lawful US residency, proof of SSN and 2 proofs of MD residency. Your passport, your SS card and two utility bills. Done!
What I don't understand is how a birth certificate can be used as proof of ID. Who looks like they did when they were a squalling infant??