This study will be a randomized, controlled, subject- and assessor-blind trial in patients with postpartum depression. Eligible subjects will be randomly assigned to active acupuncture or placebo acupuncture. The subjects will receive acupuncture treatment twice per week for 4 consecutive weeks. The acupuncturist of this trial will not participate in data collection and data entry. The trial assessor will be blind to the subjects' treatment allocation.