Adoptees — people who were adopted as children — who are at least 18 years old and have finished high school may now apply to the state Department of Health for a copy of their birth certificate. Before this law was passed, adoptees could petition the courts for their birth certificate, but a judge could deny the request. Since 1984, adoption records in Pennsylvania have been sealed.
If you put the following words into a web search engine, many sites will come up that discuss availability of original birth certificates in Pennsylvania:
pennsylvania original "birth certificate" adoptees
The law changed in 2017 for Pennsylvania to allow adoptees to obtain copies of their original birth certs. But the way I read it, the parents could choose to have their names redacted.