hello and welcome
i was diagnosed when my nursing son was around 6 months old. so that is a lot different than 3 months, but we had no issues and i nursed him until he was over 2. i checked with my OB, his pediatrician, and my GI and all felt it was safe. he always gained plenty of weight and was very happy and healthy. now that he's 2.5 he's still very healthy and happy, he quit nursing when i got pregnant, and there was no drastic change in his BMs when i went on the meds or when he quit nursing.
and you can see in my signature that i also had to take pred for a while to get my flares under control.
if you are concerned with baby's sleeping habits or other behavior, i'd say give it some time. (as you said, 3 months is a very normal time to have developmental things going on that interrupt sleep.) i had a whole 6 months of no meds at all with my son and his sleep habits would often change. just when we thought we knew what was going on, it would all of a sudden be different! :)
you could also get in touch with a local la leche league group if you want more personal support. they'll be able to get drug info for you as well as offer common sleep (or other) issues in breastfed babies.
and just remember that you know your baby best. no matter what other people have experienced, only you know how your baby behaves and if you should be concerned with any changes or if they're just a new little phase.
hope you start feeling better soon!!
29, happily married, stay at home mom to 2.5 year old son. due to have another boy 9/17/08
UC (probably pancolitis, but no c-scope yet), diagnosed June 2006, started having major symptoms sometime in January 2006, about 3 months after childbirth. 2nd flare (minor) may 2007 after taking caprylic acid for 2 weeks.
-Prednisone 8/28/06-2/28/07. and again may '07, 8 week course.
-Prayer! asacol, probio, ground psyllium husk, prenatal, folic acid, cal-mag
may you live all the days of your life.