Most women get the blues after giving birth, but the difference between that mild feeling of "being down" and depression is like the difference between a gentle spring rain and a flood.
Experts divide postpartum disorders into three classifications: postpartum blues, postpartum depression and the more rare postpartum psychosis.
The "baby blues" are usually marked by fatigue and, frequently, tears, said Dr. Lori Altshuler, a psychiatrist who teaches at UCLA Medical Center.
The blues typically start from three to seven days after birth and last a few weeks, Altshuler said. New mothers often are told that such a feeling is normal because "it helps them not feel anxious."