My youngest was DX at 1.5 years and I immediately went gluten-free with her so she could continue nursing for another 1.5 years.
StephanieL - I must have read different research than you, because everything I read told me to either wean or stick to a strict diet for her. We never had any issues as I was crazy strict with what we all ate.
Pre-dx this kid would scream bloody murder all night long, couldn't sleep (in severe pain) and nursed all the time (way more than the average kid) to soothe her belly. It was clear that her diet was hurting her.