I am new to chickens. I started my backyard flock in Oct with three 1 year old hens (P. Barred Rocks) and then I added two 4 month old hens (Black Australorps) in November. I have been feeding them all layer pellets (17% protein) and I just realized that maybe I should have been feeding the younger ones chick starter! They have definitely gotten bigger since I got them but their combs are still pretty small... have I stunted them? I'm worried that I may have messed up their development or something. What should I do?