High acceleration levels experienced by pregnant occupants in car crashes are the leading cause of foetal morbidity. Our objective is to develop a FE model of a pregnant human body to investigate various crash scenarios and understand injury mechanisms involved. A 3D reconstruction of the foetus, placenta, and uterus wall (based on MRI images of a 50th-percentile woman) was performed. These geometries lead to a continuous mesh of the gravid uterus complex, then implemented in the Radioss® Humos model. Frontal impact simulations were performed to record stress distribution on the fetus and to analyze kinematics of the uterus gravid. This model offers access to a first level of injury, and can be used to investigate better adapted security systems.