One of my Silkie chicks has a strange problem. When she tries to poop, she only seems able to get her feces about halfway out of her body no matter how she strains. I've washed her little bottom repeatedly but I don't think it's "pasty butt" or dried feces blocking her ability to pass her stool. Instead it's like her muscles just aren't strong enough to move the poop all the way out of her body. Her bum also seems swollen to me, though not irritated. Otherwise her behavior is normal - she's in the brooder with three other chicks and she seems to be eating, drinking and sleeping just fine. Does anyone have any thoughts on what this problem might be? Will she eventually grow out of it and become able to have complete bowel movements? Thanks for any advice.