I have a 13 year old daughter with cf who is not gaining weight at all. She currently weighs 64 lbs. and is at a stand still on gaining. The docs. have added zinc and changed her enzyme. We are going back to clinic in about 3 weeks to recheck weight. What if she still hasn't gained? I have read posts about people with feeding tubes, but when are they necessary? I try to get calories in my daughter, but it's like the old saying "you can led a horse to water but you can't make it drink" I'm just worried that she is withering away before my eyes. Too bad I can't give her some of my extra, I have plenty to share.