The whole point of having them attested is to prove they are original, true documents.
On the back of all of our certificates there is a stamp from a public notory. (and his seal)
Then we took document to dfat, and they have a large stamp on the back of document stating the seal of the notory is a true stamp. It then has dfat seal on page.

Also on the back of the documentis stamp from UAE embassy certifying dfats seal.
All of this is on the back of the certificates.
This is no way affects your birth certificates...and they can still be used for ID etc...but the documents need theses stamps to prove they are not forged.