We are proud new parents of 8 baby chickens. We are new at this, so I have a few questions. First, the lady at the store told us she wasn't sure how old they were, but probably about 4 weeks. She said they were "heavies?" They are not quite a foot tall when standing straight up. They have feathered wings and are trying to fly out of the box. We have them in a box in our storage room, and need to transfer them to a coop outside, but don't know when they are ready. Also, one of them has a little diarrhea. Do I need to be concerned? Also, we do not know which are hens and which are roosters. How long will it be before we can tell, and will we have trouble finding anyone to take the roosters?