Postpartum depression has commonly been linked to the hormonal fluctuations of pregnancy, but scientists say the immune system plays a much larger role than previously known.

Postpartum depression affects up to 15 percent of new mothers, according to medical specialists. Here's how to seek help.

Postpartum exercise was associated with a 45% reduction in the odds of developing depression (odds ratio, 0.55; 95% CI, 0.32-0.95). IN PRACTICE: ...