 Depression is a mental health condition in which symptoms such as sadness, inability to feel pleasure, and loss of energy interfere with a persons normal life. Postpartum depression is a type of depression experienced by women after giving birth to a child. In this study an intervention for preventing postpartum depression that has been adapted for use over the Internet will be tested. Administering a depression-prevention program over the Internet has several advantages: after the initial investment is made to develop the program, costs are lower for treating each patient; online treatment is more accessible to a greater number of people than any given clinic; and participants who may be worried about a stigma associated with mental health problems often feel more comfortable seeking information through the Internet. Previous research has shown that symptoms of depression can be reduced through Internet-based interventions, but no research has examined such interventions specifically for postpartum depression. The program tested in this study is not aimed at replacing in-person mental health carein fact, people who have signs of serious depression will be directed to in-person mental health care. Instead, the program is aimed at providing an additional mental health service among the range of available options. 