Final answer:
Dr. Benjamin Spock's book, the Common Sense Book of Baby and Child Care, changed child-rearing practices after World War 2 by advocating for a child-centric, affectionate approach that opposed authoritarian styles.
Step-by-step explanation:
The influential book that changed child-rearing practices after World War 2 was written by Dr. Benjamin Spock. His book, the Common Sense Book of Baby and Child Care, was revolutionary at the time for its child-centric approach. Spock encouraged parents to be more flexible and affectionate with their children and to treat them as individuals. The book emphasized the importance of understanding children's developmental and emotional needs and offered advice running counter to the prevailing authoritarian styles of the day.
His recommendations included avoiding physical punishment, holding family meetings for open communication, and fostering an environment where mothers were encouraged to stay at home with their children. The widespread adoption of Spock's practices notably influenced the baby boom generation and had a lasting impact on parenting philosophies in the United States.