Get a lawyer--NOW!

That's the best advise you will get. The sperm donor is not going to suddenly have a change of heart and become a DADDY. The only way you're going to get anything out of him is to take legal action!

If he doesn't contest that he's the father, and allows his name to on the birth certificate you will not have to wait to establish paternity.

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Mental that one, I'm telling you. ---Ron Weasley, "Harry Potter and the Chamber of Secrets"