Join Date: Nov 2006
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Momma to DD (12/04) and DS (11/09) .
I survived 16 mos! Ask me about breastfeeding a baby with posterior tongue tie, high palate, and weak oral motor skills- whew!
However, if the Mirena is the one you are speaking about- it works by releasing a tiny dose of Progestin into the uterine wall, which thins it out to the point that the egg cant emplant...very similar to a traditional IUD. I also think the failures would come due to a misplaced IUD or a MIGHTY egg!