Pilots: what do you do when there's a screaming baby?

Inspired by this thread, of course. What would it take for you to divert your flight? With some diseases like Meningitis taking effect frighteningly quickly, I’m wondering if in these litigious days it would be better to not risk anything. Especially if you were to bill the parents for the diversion.

Your link doesn’t work. What’s the discussion?

I’m guess it’s the Flying To Australia with a baby one

I think it would be a big leap to take from crying baby to suspicions of meningitis.

Corrected link. Sorry about that; it is indeed the one about flying to Australia with a baby.