Within a few hundred milliseconds, a young adult is able to transform pre- linguistics concepts into encoded words for speech production. The processes allowing a concept to be transformed into articulated speech sounds and how the processes involved unfold in time have been intensively investigated in young adult speakers using psycholinguistic approaches coupled with neurophysiological studies. As compared to young adults, children present longer word finding and speech planning times, which means that the dynamics of language production must differ in children in comparison with young adults, due to learning and brain maturation. The way these processes mature to reach the processes described in (young) adults has not been investigated yet: is it a time-scaling of the same processes that are involved in development from childhood to adulthood or are different processes involved? In the present dissertation, I seek to investigate how the mental processes involved in language production and their time‐course change across the development, i.e. how the maturation evolves into the dynamics observed in adult speakers and which processes are mainly involved in the path to the adult-like activations.