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evidence: What to Expect When You 're Expecting is a pregnancy guide , now in its fifth edition , written by Heidi Murkoff and Sharon Mazel and published by Workman Publishing .. Heidi Murkoff. Heidi Murkoff. pregnancy. pregnancy. Workman Publishing. Workman Publishing. Originally published in 1984 , the book consistently tops The New York Times Best Seller list in the paperback advice category , is one of USA Todays `` 25 Most Influential Books '' of the past 25 years and has been described as `` the bible of American pregnancy '' .. pregnancy. pregnancy. , over 14.5 million copies were in print .. According to USA Today , 93 percent of all expectant mothers who read a pregnancy guide read What to Expect When You 're Expecting .. pregnancy. pregnancy. USA Today. USA Today. In 2012 , What to Expect When You 're Expecting was adapted into a film released by Lionsgate .. Lionsgate. Lionsgate