Hi, my dd2 is 8 and has had a Gastrostomy since she was about 4 or 5. She has SLD and physical disabilities, and eating was very difficult and slow, she was aspirating and getting ill.
How well does your dd eat? Do they know why she is not putting on weight? Does she aspirate, or is the problem her slow eating speed?
You might start with an NG tube, which is worse than the gastrostomy, because the child can pull the tube out and you have to re-pass it, because it's irritating to the face, its unsightly.
Putting the tube down is easy and much less stressful if you learn to do it yourself - we found we would rather do it at home than traipse to the hospital to wait for a nurse to do it. Just wrap her up in a blanket to stop the fighting, and go for it, then a good hug afterwards. It takes seconds.
Some children have a silk NG tube passed each time they need a feed - maybe once a day for a bit of feed and liquid, then it is removed.
You have to withdraw and ph test some stomach fluid before you feed to check that the tube is in the right position - that is easy.
The mickey button easier to use because you don't have to check the position, you just connect up and feed. It is tucked away under the clothes just above the belly button, hidden from fingers and stares! . We empty and refill the balloon (which keeps it in place) with cooled boiled water once a week, and I change the whole kaboodle myself every few months - or you can go to hospital for that bit.
I don't know about the diahorrea thing its not something we have had - we have no more illnesses than with oral feeding - in fact less, because she gets a decent amount of food and hydration into her to keep her healthy, and we don't get nearly as much aspiration. Her weight gain is controlled by the diet, so she is not too heavy to manoeuvre.
Getting meds down the tube is much easier than orally.
So for us, the gastro feeding has worked out well, she would be much worse without it. At first I was like you, trying to resist it, but I see now how much it has helped her.
Any questions, fire away!
BTW, the decision is yours, not the doctor's!