This chick peeped 2 days ago but never unzipped. I helped it along by taking a little more shell from around the air sack then let it finish hatching itself, which it did about 30 minutes later. It is now 4 hours old and hasn't fluffed, but seems otherwise strong. It's rear end looks off to me though. Like maybe it's distended. It's very shiny but I don't see any film on the chick. Should I be concerned? Should I rinse it in warm water then put it back in the bator?