2 1/2 weeks ago I bought my first chickens at tcs-2 of them where white leghorn pullets, 4 Rhode Island Red and 2 barred rock. They were all them same size. I have gotten more since then The white leghorns grew faster than the others but everyone is growing so fast I figured the between the breed and they might have been a day or two older or something. Well the last few days one of the two leghorns has gotten much fatter than her sister ( maybe a third fatter) her poop is normal, no pouch in front of neck, but her feathers are scruffier than her sisters but otherwise nothing I noticed ( she is skittish compared to others but that could be the breed?)Should I be concerned or do I just have a little pig instead of a chicken? Anything I should watch? Read up on? Newbie here so any advice is welcome.