http://
Copyright 2006 www.stopdepressiontoday.com
Following the birth of a baby, the risk of depression is increased in the mother.  Possible causes of postpartum depression include psychological and social stressors, hormonal changes, and genetic factors.  The most common form of postpartum depression is a mild form often referred to as the “blues” that occurs in up to 50% of women.  It begins within days of delivery up to several weeks later, is of relatively brief duration and severity, and responds well to reassurance and support.
The most serious form of postpartum depression is a psychosis that occurs in about 1 to 3 per thousand.  It often begins shortly after delivery, with 40% of the episodes beginning by day 7.  This is a very serious high risk condition characterized by hallucinations, delusions, and confusion that usually requires hospitalization and treatment with medication and sometimes with electroconvulsive therapy (ECT). Although postpartum psychosis has often been misdiagnosed as schizophrenia, it is almost always a form of depressive or manic-depressive disorder.

Overall, women with a history of mood disorder (depression or manic depression) prior to pregnancy are at greatly increased risk for a postpartum recurrence. Consequently, such problems should be anticipated and proper attention paid to reduction of stressors and the possible preventive use of medication.  Close collaboration between obstetrician, pediatrician, and mental health professional is essential. 
About Postpartum Depression
About 10% of women experience a more severe and sustained depressive episode that meets diagnostic criteria for major depression. Onset is usually during or after the third week following delivery and duration can be many months.  Professional intervention in the form of psychotherapy and antidepressant medication is usually quite helpful.