What to Expect When You Are Expecting Completely New & Revised Fourth Edition by Heidi Murkoff & Sharon Mazel. 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 a new generation of expectant moms-featuring a new look, a fresh perspective, and a friendlier-than-ever voice. It's filled with the most up-to-date information reflecting not only what's new in pregnancy, but what's relevant to pregnant women.