What happens to a couple's relationship when baby makes three? Why do some relationships improve and others falter? Based on a ten-year study of 100 pairs of first-time parents, this book charts the tumultuous changes that greet the arrival of a first child, one of the most common, but least understood of life's passages. Drawing on the stories of a wide variety of men and women, the authors reveal common pitfalls, and offer councel about early parenthood.