Gathering Information:
Searching for birth parents might seem daunting to an adoptee without much information about the adoption, so it helps to start small. Gathering any data readily available, however little it may seem, is one way to start. In some cases, that might be nothing more than the date of birth. If so, it's likely time to talk to the adoptive parents. This can be an emotional topic to bring up; however, they may be able to fill in some, or many, of the blanks that remain. They may even have a copy of the initial birth certificate, as well as the amended version.
Initial versus Amended Birth Certificate:
The initial birth certificate is issued with fake birth certificate the information provided by the hospital at the time of a birth, and can provide clues as to the identity of the birth parents. The amended birth certificate is a legal version that's been updated to name the adoptive parents as the official parents. If the adoptive parents do not have a copy of the initial birth certificate, don't become discouraged.