She is losing weight and off her feed, suddenly. 6 weeks old. She (and all of our chicks) had Corid in the drinking water for a week two weeks ago, but have since switched to fresh water. All seemed fine until now. She is with just one other pullet right now, who looks and acts normal. Usually,pullets do not need to be dewormed until they are at least six months old and we have never done that, but this has been a very unusual year weather wise as we have had torrential rain almost every day these past few weeks. the pullets have been outside in the tractor on the grass a lot, but not with the flock yet. Could she have worms? I haven't seen any, but we have had problems with capillary worms in the past. As a result, we deworm our flock regularly every six months. I am trying Corid again but just wondering if anyone else has had similar problems.