Newbie........Need Help! I took a bird to the vet today to try and get on top of cough; but that is not my concern. She said my chicken was thin and breast bone was prominent. I have 6 other chickens; still pullets Not quite sure how old they are (think born in March?; and seller told me to start Layer Food July 31) How old is that?) They are mixed flock ameracauna, lace, speckled sussex, brahma, aussie, buff orphington, welsner. When I got home I checked all the other chickens and they, too, had prominent breast bones. They have fermented chick feed available all day. They don't have worms. They also have access to grazing in a fenced yard with grass, plants, and plenty of bugs. I feed them a small treat of dried worms in the morning, and some (very little) other scraps. They seem to eat well. They are definitely growing and getting larger and seem to be fine. She scared me so I bought some scratch and now throwing that out also. I think they are a little skinny because they are growing rapidly; what do you guys think? Really appreciate your opinions.