Re: from vs since
"He was deaf from birth" certainly suggests continuity to me. Unless advised otherwise, I would assume that "he" continued to be deaf until he died.
"He was deaf at birth" might not suggest the same but even then, one would have to be told that the situation changed at some point during his life in order for it not to be assumed to be continuous.
Regarding your second post, I can understand that you might have been frustrated that your post had been overlooked for 7 days but such a terse post without even using "please" made me consider not bothering to answer.
Remember - correct capitalisation, punctuation and spacing make posts much easier to read.