My doctor told me last week that for breastfeeding, the only options were the mini pill, IUD, or getting an implant (Implanon, updated version of Norplant).
Here is a comprehensive list of birth control options from the Mayo Clinic:
http://www.mayoclinic.com/health/birth-control/BI99999/PA...
Before I got pregnant, I had Mirena, and I loved it. I had it in for 3.5 years. It was definitely uncomfortable to have it inserted, but way better than giving birth! I just ached for a day, and Tylenol helped with that.
Right after I had it inserted, I had spotting for approximately 8 weeks, but then my periods slowly got farther and farther apart until they were only occurring once every 12 weeks. Three of my friends have had the Mirena inserted, and none of them have had any problems with it. My favorite part was that the progestin was only released locally, into the uterus, and wasn't a systemic (body wide) drug.
Since I saw my doc, I'm now on the mini pill (I'd get the IUD again, but we're planning another pregnancy in 6 months). Since my son (9 months) always goes to bed at approximately the same time every night, I just take it when he goes to bed (or if he goes to bed early, I set a kitchen timer to go off when it is time). I'm not sure if it's an affect of the pill, but since I started taking it, it has helped my almost non-existent libido immensely!! (I'm VERY happy about that, and hubby is too!)
Good luck with your research and decision!
*Chassidy