You need to remember..if she has a dirty, wet diaper, three ounces just went out the back end... Timing is crazy when ounces count for weight checks. I remember when we had weekly and biweekly weight checks (between 12 months and 2.5 years) that as long as danny was within 8 ounces (.5 pound) of his last weight, he was considered as weighing the same because pooping or peeing can vary a weight by that much. Try to get there early and feed her right before you go in so that she will have the boost..at least for tomorrow... :/ I would maybe request certain tests if they do decide to hositalize her. I would include a pancreatic function test, a ph probe, an endoscopy with a biopsy of esophagus, stomach, and duodenum, and a holter monitor for her heart rate. If your GI thinks she needs to be admitted, I would allow her to be admitted to the hospital that your GI works with...not your ped. I would request that a care team be made up of a cardio, endo, GI, and a nutrition consultant. Maybe a nutrition consultant (or lactation consultant) could give you ideas of foods to eat to increase the fat and calorie levels in your milk. This sounds like a lot but if she is going to be admitted and have testing then they should kill as many birds with that stone as possible... I wouldn't object to a feeding tube if they would allow you to run the feeding tube all night and let her nurse all day. That will keep her supply up and keep her nursing so that once they figure out what is wrong you will still be able to nurse her. Nursing brings soooo much comfort to babies and she will need you for that... Is she still on a feeding schedule or do you offer her milk whenever she is whiny? If you offer whenever she is whiny as a first option she may eat more. If she is nursing for comfort that is still getting her to take in calories.