Here's my two cents...not like you asked for it, but hey...
I assume you or a family member has celiacs? Your child is almost one and having issues. I would make the Drs rule out diseases through testing. Rule out celiacs through endoscopy or EnteroLabs. Until they provide test results to indicate something is negative, I would not take their word for it.
My reasoning, I have a 2.5 yr old. She had problems at 9 mths. A solid year later and still the drs just wrote it off as a petite child, just the way she is, not failing to thrive...She was falling off the growth charts and had barely grown in a yr. They also insisted that SHE CANNOT have celiacs because she is too young, because she is growing, the rash is nothing, the constant diarrhea is just her system, etc. I heard it all. After fighting with them to test her, turns out she is allergic to dairy and has celiacs gene. The biopsy was inconclusive. But after following drs orders and getting nowhere, she is now gluten-free/CF and growing, gaining weight, and the rash is gone. She had other issues, but those were the big ones.
When she was an infant, she had colic. They gave her GERD drugs and all kinds of drugs trying to help her. When they gave her a serious drug that I was on for stomach problems, I knew we had a problem. To date, she has been prescribed a variety of medications that are not for children or have some terrible side effects. I no longer trust drs.
So IMO, make the drs rule out diseases through tests, do just take their word for it.