I went to a local feed store and they didn't seem to have chick food from 5 to 16 weeks. The store manager was dumbfounded, as the bag I wanted always said from 0-18 weeks (they are crumbles). He said they must have changed the label. It now says from 0-5 weeks. Mine are 5 weeks today and I had to buy it because I was out of food. I think they will be fine, but should I keep using it?