How long after delivery can IUD is related to the mode of delivery, generally about 3 months after normal delivery, and about half a year after cesarean section can IUD. The IUD is placed in the uterine cavity, and it is recommended that the uterus recovers better before the IUD is inserted. The recovery of the uterus after delivery needs a process, generally about 3 months after normal delivery, the uterus will get a better recovery, while the recovery of the uterus after cesarean section is slower, the recovery of the uterine incision takes about six months. If you get the ring too early, the uterus has not yet fully recovered, which may cause the ring to be ectopic and fall off during the operation, or even cause the uterus to perforate and other adverse consequences. After IUI, you should pay attention to proper rest, avoid lifting heavy objects within half a month, keep your vulva clean and take oral cephalosporin antibiotics to prevent infection. In addition, it is recommended to go to the hospital gynecology department for ultrasound review after 1 month to observe the specific position of the ring.