Nonhormonal: The hormone-free IUD, ParaGard, is up to 99 percent effective and is placed in your uterus to prevent pregnancy for up to 10 years. Common side effects include heavier periods, longer periods, and spotting in between periods — all of which should diminish within three months.
Hormonal: Recommended for women who have had children, Mirena is also over 99 percent effective and lasts for up to five years. It delivers small amounts of progestin locally into your uterus to prevent pregnancy but is still safe for breastfeeding moms. However, there is an increased risk of perforation — when the IUD becomes attached to or goes through the wall of the uterus, which can cause infection and may require surgery — when using Mirena while nursing.
