Is mirena (levonorgestrel) a good method of birth control for a 20 year old 6 and a half months postpartum ? and is it painful?

GREAT method: Mirena (levonorgestrel) is very effective (as effective as sterilization but completely reversible), very easy (good for 5 years), and safe. Many women also have much lighter bleeding with periods and less cramps. So it's a great method. Women who've had a baby typically describe the quick insertion process as moderately crampy (and nothing at all compared to labor). Ask your dr, but i'd strongly recommend it.

Yes: Mirena (levonorgestrel) is a great form of birth control, and will probably not hurt when it is inserted, especially if you had a vaginal delivery. Try to arrange to have it put in when you are on your period. This will decrease any pain you might have with its insertion.