†David Germanaud and Jessica Dubois contributed equally to this work. Magnetic resonance imaging has proved to be suitable and efficient for in vivo investigation of the early process of brain gyrification in fetuses and preterm newborns but the question remains as to whether cortical-related measurements derived fromboth cases are comparable or not. Indeed, the developmental folding trajectories drawnup fromboth populationshave not been compared so far, neither from cross-sectional nor from longitudinal datasets. The present study aimed to compare features of cortical folding between healthy fetuses and early imaged preterm newborns on a cross-sectional basis, over