ALL the chickens I have had started from last spring till now, get EXTREMLY skinny around 2-5 months, when they hit around 6-7 months they put on weight and are just fine, But it really bothers me, They eat alot of grower/layer, Sweet feed and corn and greens. I've tried giving them some yogurt before to, its not just a few chickens, Its EVERY chicken has went through their skinny period, they otherwise look healthy and act just fine but when you pick them up the front of their chest feels like a V from the tip to their sides. I also was told it may be worms, getting treatment this week but could it seriously have been every single chicken? even at different times?