We are brand new to chickens.. We have seven chicks, they are plymouth rock pullets, and we have had them for about a month, got them as tiny babies at the farm and feed store. One is very swollen today. The whole body is huge.. she walks with a waddle and she is eating and drinking with the rest of the chicks. Yesterday she seemed fine, not swollen. I had my husband pick her up so I could look at her better. Besides being big she seems fine. I checked her butt.. and it looks fine.. I sort of "whiped" it a few times with a paper towel to see if she was all pasted up.. looks fine and she squawked at that, and when we put her down she pooped twice.. say maybe an inch long droppings twice.. so she is pooping.. her chest feels full of fluid.. They are all in an enclosed house, with a heat lamp and clean shavings.. any ideas on what is wrong or what else information wise that might help??