In order to explore the coincidence of these two forms of identity crisis, adolescence and motherhood, two hypotheses are offered: one dealing with the cultural factor in the avoidance or facilitation of psychopathological disorders ; and the second considering pregnancy and motherhood as antinomic with regard to adolescent processes. These lines of thought are developed in three parts. The first, which is based on an interview with Inès, a young mother of gypsy origin, helps one to understand how the cultural space, shared with the outer social world, lends itself to bearing the inner psychical world. In the second part, pregnancy’s resistance to adolescent processes are dealt with through the novelties of the pubertaire and narcissitic issues. In the third part, we present the treatment of a pregnant adolescent and her family within the setting of a multidisciplinary parenthood support network.