My daughter is mostly pancreatic sufficient, but takes enzymes even though the tests show she doesn't need them. She is scheduled to have a g-tube next month. <img src="i/expressions/face-icon-small-sad.gif" border="0"> We've tried everything to get her to gain weight, crazy high cal foods, night time pediasure drinking, etc. We have gotten to the point where her failure to thrive is impacting her liklihood of growing large enough lungs to best fight this disease. So we have consented to do the tube.
I don't know that there is much you can do to avoid it, if your child just doesn't grow well even with enzymes. I don't think all CF kids (or even half) have g-tubes, but there is a percentage that do.
The way I see it now is that the median age of survival has increased over the past couple of decades due to people sitting in the corner doing nothing to help their CF. It comes from using all the reactive and proactive medical advances that have come available to us. The g-tube is just one of those things. And if it will help in the long run, than its worth it.