I know just about everyone in the United States knows what a raccoon is, but have you ever heard one?
That's what an upset baby sounds like. Quite an interesting noise, in my opinion. These animals are known to actually produce a wide variety of sounds. This is usually various sort of chattering sounds, but they can also purr and squeal, among other things. Just remember, though these critters can look cute, never mess with one because they are known to commonly carry rabies. And don't think they won't bite you, because they can and it's likely that they will if cornered.