I had one inserted when my youngest was 3 months old, it was quite a painful insertion as my cycle had not yet returned and they needed to dilate me to get it in. At the 6 week check up the string could not be found, an x-ray found the iud near my left hip. They think it must have perforated the uterus on insertion. Needless to say I needed laparoscopy to remove it. I now use condoms as contraception
Michelle