Hi I'm malachy and I had a g-tube for the first eleven years of my life so im very experienced with it. I would say that after it is first placed you will have irritaion around the site and if your stomach is active then stomach acid will burn the area around your g-tube too. The way that my site was cleaned was by getting a q-tip and wiping the cruty dried up acid or other particles with hydrogen peroxide. A g-tube is more beneficial than an annoyance if it were not for it I would be dead, so here are the pros and cons:
PROS: You get to eat while you sleep!, you should be able to keep an apporpriate weight so that your not too skinny or sick, even when you feel sick or dont have an appetite you can still be fed through the g-tube, nasty liquid medications that you take through the mouth can be pushed through the g-tube, and there are now portable units that you can stick in a backpack and no one will know-so you can eat unknowingly during the day! oh and if you ever gain too much weigth the doctors can adjust the dose
CONS: The site can feel iritated, while doing the VEST the g-tube can be moved around (to avoid this the VEST company has a new foam that will prevent this irritaion), you have to change the tube every month or three (i cant remember how many months), if you're sleeping and the g-tube pops your bed will get soaked with nutrients or the pediasure or peptamin or etc., if the g-tube pops you better get another one because that hole can close up fast! (like half an hour for my friend who had to get their's redone, always keep a supply of g-tubes!), going down a water slide might not be as fun either... the stomach acids can burn a lot but I also have very active stomach acids so you probably dont need to worry about that.
Well that is all I can think of and I'm 14 now and I have the normal not average weight that im supposed to. I would not be too worried just be prepared; the g-tube can get annoying but its definatelly worth it!
P.S. the way I got rid of my g-tube was by taking an appetite stimulate called MEGACESTROL and it literally saved my life maybe you should talk to your doctors about it?