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Doctor Spock (1940s and 1950s)

In 1946, pediatrician Benjamin Spock released a book, Baby and Child Care. In it, he claimed that parents knew more than they thought they did about how to raise a child. His advice was to relax. Americans took to it like a bee to honey. Within 10 years, his book was the second best-selling book in the U.S. (Sorry, Spock, nobody can outsell the Bible.)