[The "king child" and nutritional variations or the "loving black-mail"].

The "King Baby" is like a tyrant against his/her family with his/her refusing or requiring attitudes. This well known entity is analyzed in the actual social and familial context and compared with the similar situation in the countries with nutritional deficiencies. The impact of this relational problem on nutrition is detailed as especially weaning is concerned as well as the eventual consecutive and selective anorexia. A relational solution has been proposed: the "loving black-mailing" with early detection of "mothers or situations at risks".