 Depression is a serious condition affecting millions of people each year. In fact, it is estimated that approximately one in every four women will be treated for a mood disorder, such as depression, at some point in her life. As effective treatment options continue to develop, many women diagnosed with depression are able to resume normal lives and may choose to become pregnant. Also, some women become depressed when pregnant. Interpersonal psychotherapy involves treating psychological difficulties by analyzing problems, talking about possible solutions, and learning more helpful ways of thinking and acting. Brief interpersonal psychotherapy IPT-B is a well-tested psychotherapy for depression that has been shortened and modified. The purpose of this study is to evaluate the effectiveness of IPT-B to reduce depressive symptoms in women during pregnancy and to prevent the continuation or recurrence of their depression postpartum. 