I had my mirena put in when DS was 4 months old. The actually procedure was nothing to worry about. I had it done in my OB office and didn't even notice he'd done it. I also didn't need any pain relief afterwards. I did have slight cramping for that afternoon. I bleed/spotted on and off for about 8 weeks. The first day or so were like the beginning of a period but then nothing heavy really just annoying and a panty liner was enough. DS never changed his b/f'ing at all (I was warned some may self wean). I haven't had AF since. I will occassionally get some pimples but that's it. I did have to go back in after a month or two as my wire had moved and it was poking DH whenever we DTD. Overall I am really really happy with it.