His Common Sense Book of Baby and Child Care 1946 urged less rigidity in bringing up children than had been advised by previous generations of writers on the subject, but this was misunderstood as advocating permissiveness. He was also active in the peace movement, especially during the Vietnam War. In his later work he stressed that his common-sense approach had not implied rejecting all discipline, but that his main aim was to give parents the confidence to trust their own judgement rather than rely on books by experts who did not know a particular child.
