Attachment parenting is only one of many responsiveness and love-oriented parenting philosophies that entered the pedagogical mainstream after World War II, and it owes many of its ideas to older teachings, such as Benjamin Spock's influential handbook Baby and Child Care (1946). Spock had mothers advised to raise their infants according to their own common sense and with plenty of physical contact – a guideline that radically broke with the preceding doctrines of L. Emmett Holt and John B. Watson; the book became a bestseller, and Spock's new child rearing concept greatly influenced the upbringing of the post war generations.