The Birth certificate reference article from the English Wikipedia on 24-Apr-2004
(provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Birth certificate

Sponsorship the way you would do it
In most forms of government, a birth certificate is an official legal document usually describing

The official birth certificate is stored at a government record office. The person also holds an official birth certificate.

In Canada and the United States of America, it is stored with the government of the receiver's state or province.

The birth certificate is used to authenticate one's identity and nationality, and assist with obtaining government IDs, such as a passport or driver's license. Holding a birth certificate makes it easier to prove citizenship in nations where citizenship depends upon location of birth.