A child is envious of the opposite gender due to their genitalia.
If you understand transgender, then you understand that gender doesn't have to do with bed partners, it is to do with identity.
The concept behind "AM I A MAN?" is that of gender envy and the identity behind gender itself. Inspired by Freud's theory of gender envy in young children, the silhouette and colour palette have responded to that. The playful colours and print reflect that of a child's understanding of gender and how free the emotions are that accompany it.