Purpose This paper aims to characterize the 3D geometry of the child spleen which is still unknown. Methods An anthropological measurement protocol, based upon 3D modeling using spleen-computed tomography data, was set up. Characteristic measurements were defined to allow dimensions and spatial localization description from classical anatomical landmarks (11th dorsal vertebra and 10th left rib). Results Growth patterns showed a global enlargement without significant changes in distance to anatomical bone points. Conclusions This preliminary study describes a validated measurement protocol based on 3D reconstructions and gives description of the child spleen during growth. Child - Spleen - Growth - CT - Modeling