Surprising rate of women have depression after childbirth, study finds

"This is the largest scale depression screening of postpartum women and the first time a full psychiatric assessment has been done in a study of postpartum women who screened positive for depression. The study, which included a depression screening of 10,000 women who had recently delivered infants at single obstetrical hospital, revealed a large percentage of women who suffered recurrent episodes of major depression...."
http://medicalxpress.com/news/2013-03-women-depression-childbirth.html