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In page Benjamin Spock:

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Spock advocated ideas about parenting that were considered out of the mainstream. Over time, his books helped to bring about major change. Previously, experts (such as Truby King) had told parents babies needed to learn to sleep on a regular schedule, and that picking them up and holding them when they cried would only teach them to cry more and not to sleep through the night (a notion that borrows from behaviorism). They were told[citation needed] to feed their children on a regular schedule, and that they should not pick them up, kiss them, or hug them, because that would not prepare them to be strong, independent individuals in a harsh world. In contrast, Spock encouraged parents to show affection for their children and to see them as individuals.[5]