I just recieved baby chicks in the mail yesterday. This was my first time ordering threw the mail. One of babies, a Salmon Favorolle, was very fat and round! I picked her up and she felt like she was about to pop! She looked like a balloon. Her skin was very tight, and she was so filled up that her legs were pushed to the side and she had to wobble to walk. After handling her more, a put her down then noticed she had deflated! I picked her up again and sure enough, the air was gone! I have no idea how it happened. She stayed deflated for maybe 24 hours, but has filed back up again. She is eating and drinking, and I have been keeping her vent clean. Please any help or advice on what this could be and how to fix it?