Participation in this study will last 3 months. All participants will be offered a Web-based version of CBT for PPD. The CBT program will include guided behavioral strategies for dealing with depression, online videos of women who have used these strategies, Web forums in which participants can ask questions of peers and experts, and periodic phone coaching. The program will last 6 weeks. All participants will complete assessments at baseline, post-treatment, and 3-month follow-up. Safety monitoring questionnaires will also be completed at Weeks 2 and 4 of treatment. Assessments will include clinical interviews and questionnaires related to the following: health; depression; demographics; maternal skills, stress, and self-efficacy; Internet use, experience, and self-efficacy; behavioral self-efficacy; and program acceptability.