I can't answer your question, but I do want to tell you that my supply completely dried up at the first of December. At that time, I was in a full flare, but I hadn't been diagnosed yet. I started to get better on my own (because of probiotics???) about a week and a half later. Anyway, I think that my supply dried up because my body couldn't manage to produce milk due to all of the diarrhea I was having. I guess what I'm trying to say is don't let yourself get really sick because you're trying to breastfeed and are afraid to take enough meds to keep yourself well. It was really hard to admit I could no longer breastfeed my son, but he's a happy, healthy, formula fed baby.
Symptoms began in November 2008, ~4 weeks after giving birth to my son.
Eased for ~3 weeks in December, possibly b/c of probiotic use?
Returned in January 2009 (with a vengeance), diagnosed with pancolitis on January 30.
Currently taking Asacol (400mg 4 pills 3x daily), Rowasa nightly, Culturelle probiotic, and Zoloft (25 mg).