Researchers at the Lousiana State University claim to have found a region in the brains of female rats that respond to oxytocin. A corresponding brain region is not found in the male rats. The oxytocin receptors are active only when estrogen is produced in the female rats. This could potentially help discover solutions to postpartum depression and other mental health disorders in humans. Post partum depression negatively affects the mother s health and also development of the new born. The child becomes vulnerable to cognitive, emotional, behavioral and medical problems. About 10 - 20 % of mothers experience post partum depression. It is a major public health concern.