Four research findings that will change what we think about perinatal depression.

Research by health psychologists is changing what we know about perinatal depression. In this guest editorial, the author examines depression in pregnant and breastfeeding women in light of this recent research and describes four major findings that are influencing how we think about depression in new mothers: inflammation has an etiologic role in depression, a relationship exists between sleep disturbances and depression, breastfeeding protects maternal mental health, and all effective treatments for depression are anti-inflammatory interventions.