4. The primary Axis I diagnosis, as determined by the SCID, must meet the DSM-IV criteria for Unipolar Major Depression, Single or Recurrent, Moderate to Severe. Onset of depression must occur within pregnancy to the first 12 months following childbirth. Concurrent diagnoses of anxiety disorders including obsessive compulsive disorder, panic disorder, specific phobias, generalized anxiety disorder, and post-traumatic stress disorder will be allowed if they are not the primary diagnosis.