I really doubt they would consider a G-tube this late in the game for your son. I am sure a lot of his issue not gaining weight is because he is active. My mom told me my brother only gained 4 lbs between 6 months and 2 years. Way back then the doctors were concerned because my brother was a full term baby. None the less, he grew up to be 5'8". That's pretty good considering my dad was 5'4" and my mom is 5'1".
The reason she told me this was because we are worried about our son. He turns one in a week and he is only at 15 lbs 4 ozs. The real problem is he has started to move around a lot and therefore, has only gained 3 ozs. in 3 weeks. He was gaining about a pound a month before. We have two issues with him, one he has a severe milk protein allergy. I still express my milk for him and I have to be very careful with what I eat or he vomits (it's not easy when you eat take out 3-4 times a week) Two, he was never fond of the bottle. He is doing OK with solids, but the GI doctor still feels that he needs to get his primary nutrition from milk. We may try the other way around though, because he is just so much easier to feed solids too.
I asked his GI doc if their was a secret weapon. The only thing we could do at this age is add extra scoops of formula to the EBM to add calories. But the hypoallergenic formual doesn't taste great, and he seems to eat less when we add. So, we are at a loss for now.
I would definitely talk to the Pedi about alternate foods you could give your son, now that he is 2 there may be some foods that could work. Our Pedi recommended avocado for us, which worked for awhile, until he decided they didn't taste good anymore.
Good luck and keep me posted on what they recommend.
DH, John (35)
Max, 1/20/03, 25 wks, 534g. (IUGR), severe PE