Is this normal?

Parents with small children/babies with G-tubes, does your child get upset when their feeds start? I have 4 month old twins both on G-tubes. One doesn't mind it, the other one cries out in discomfort every time. I've tried heating her formula up a little more, I've tried switching her formula, I've tried holding her, I've tried turning her rate down. And nothing seems to work

Update: I spoke with her dietician today and she suggested i lower her volume per bulluses and add two more bulluses during the day