Announcing a brand new, cover-to-cover revision of America's pregnancy bible. What to Expect When You're Expecting is a perennial New York Times bestseller and one of USA Today's 25 most influential books of the past 25 years. It's read by more than 90% of pregnant women who read a pregnancy book—the most iconic, must-have book for parents-to-be, with over 14.5 million copies in print.

Now comes the Fourth Edition, a new book for

Announcing the prequel. From Heidi Murkoff, author of America's bestselling pregnancy and parenting books, comes the must-have guide every expectant couple needs before they even conceive—the first step in What to Expect: What to Expect Before You're Expecting.

An estimated 11 million couples in the U.S. are currently trying to conceive, and medical groups now recommend that all hopeful parents plan for baby-making at least three