Perforation of the uterus by an IUD is very rare. However, during the puerperium when the uterus is small and the uterine wall is thin the risk of perforation increases. We present three patients treated within a rather short period of time at our institution for perforation of the uterus caused by IUD insertion 3-4 months after delivery. Although perforation is by no means always associated with pain, our patients did present with abdominal pain caused by this rare IUD-associated complication. One patient underwent laparotomy, and in two, laparoscopy sufficed to treat this complication.