While my story isn't exactly like yours, it's similar. I developed UC right after childbirth, which I've been told is fairly common. The thought is that since your immune system is suppressed during pregnancy, it tends to bounce back with a vengeance after the child is born. Which can cause many autoimmune disorders to flare up. I got my UC diagnosed & was put on Rowasa enemas & Asacol, which helped tremendously. I breastfed for 27 months, & had no surge in UC symptoms upon weaning. I would think that stopping breastfeeding itself shouldn't cause your flares to worsen- your body is still in that postpartum stage where the immune system is overcompensating. So weaning may help your UC. I became really awful when I stopped my Asacol, about
3 years into the disease. Then everything fell apart, leading to pred, Imuran, Remicade, etc. I'm doing ok now, not great, but manageable. Surgery may be in my future also. You may flare up a bit around your period, but overall I don't think weaning your child will have much effect on your UC, good or bad.
diagnosed with UC '02
Asacol- 8 tabs/day
Remicade-10mgs/kg- since 4/07