The hormonal intrauterine device is a birth control method that releases the hormone levonorgestrel. It is also used to control heavy menstrual periods prevent the excessive build of the lining of the uterus among women on estrogen replacement therapy. Implantation of a hormonal intrauterine device (IUD) immediately after birth does not affect lactation and breastfeeding, finds a new research by a research team at University of Utah Health and University of New Mexico School of Medicine.