The aims of this paper is to define the injuries sustained by children, pedestrian or rear end car occupants, and to compare their lesions with those suffered by adults.

We notice some differencies which can be explained by differencies (height and weight) but also by the dynamic of the children and by a different tolerance to impact.

This paper try to explain the differencies noticed between children and adults:​ it purposes some explicative ideas, which can be verified by specific studies.