I too would just keep watch since it's not stopped eating/drinking.I don't see anything abnormal, but then again it's still so small now. I checked the inside the beak too, just a few tiny bits of food in there. I could be paranoid but this chicks sounds a bit different when drinking, like louder.
It's sneezing approximately every 30 seconds, I haven't seen it stop eating or drinking to sneeze yet.