Mirena Side Effects: It's me again! So, either this is the weirdest coincidence ever, http://www.medications.com/effect/view/33720 It's me again! So, either this is the weirdest coincidence ever, or just another lovely side effect of mirena. I had a baby in march08, in may08 I had mirena put in. Strangely, my 2month old started spitting up A LOT. And I'm not talking a little spitting u I think the hormones in the Mirena made your baby nauseated and s Fri, 22 Aug 2008 18:14:33 -0400 http://www.medications.com/effect/view/33720?item=11478 I think the hormones in the Mirena made your baby nauseated and so she vomited...reaction to the hormones. I have three young children of my own, and with them, I used a contraceptive pill that can be taken for nursing moms, I don't remember the name, it' http://www.medications.com/effect/view/33720?item=11478