Girls, hi! We have a bit of weight loss due to problems with our bowels…

Girls, hi! We have a bit of weight loss due to problems with our bowels, we haven't gained any weight for the last month. We're on IV, now the baby refuses night feedings altogether, she wakes up at 9 and then we feed her formula, I don't even know what to do ??‍♀️ The pediatrician said that we need at least one night feeding.