Clean Break Theory (c. 1940 - c. 1970)

Clean break theory gained widespread acceptance following World War Two. The results of Nazi rule in Germany discredited eugenics with its emphasis on hereditary characteristics. Experts increasingly claimed that babies were a 'clean slate' to be shaped by their environment. For instance, Sigmund and Anna Freud believed in adoption with early separation of mother and child on this basis. Similarly, the influential British psychologist, psychiatrist, and psychoanalyst, John Bowlby, argued for prompt separation of the birth mother and baby so that early experiences did not disrupt personality development. This also helped the adoptive parents to create stronger bonds.

Married couples were considered able to provide more advantages than single mothers. In this way, clean break theory gave credence to a widespread policy of removing the babies of these mothers between about 1940 and 1970. To prevent disruption to the adoptive family, birth mothers were not given any information about the whereabouts of their children.