Welcome back to the Wefugees Community and thank you for reaching out to us.
Our platform and our experts are based in Germany, that is why we unfortunately might not be able to share much information and expertise on regulations and procedures in Italy.
However, as I also had some difficulties to understand your situation and what exactly you are looking for, I would like to ask you to provide us some more details. For instance: Do you need a birth certificate for yourself (born in another country) or for a child born in Italy? What do you mean with "replacing" and what exactly the birth certificate is needed for?
Looking forward to hear from you again.
All the best,