Validation data for assessing dummy child biofidelity are limited, especially with regard to whole-body kinematics. Therefore, the goal of this study was to assess the kinematic biofidelity of current child dummies relative to results obtained from analysis of a child cadaver sled test. The baseline data were obtained from a previously unpublished test performed with a 13-year old pediatric cadaver restrained by a three-point belt. The cadaver test conditions were reconstructed using two dummies with anthropometry closest to that of the cadaver, the HIII 10-year old and HIII 5th female dummies. Due to anthropometric and age-equivalent differences between the dummies and the child cadaver, geometric scaling was performed on the signals based on the seated height and material properties. Kinematic evaluations of head, hip, and knee trajectories were obtained from film analysis. Accelerations of the head, shoulder and lap belt loads were measured and compared among the dummy and child cadaver data. While this study shows that the HIII 10-year old, scaled HIII 5th female and scaled pediatric cadaver reasonably agree for the shoulder belt force, the resultant head acceleration, and the maximum head excursion, differences in kinematics were identified between the dummies and the cadaver. Some of these differences in dummy kinematics were attributed to nonbiofidelic motion of the rigid thoracic spine with extensive bending at the cervical and thoracic spine junction. In addition to new cadaver data, the study provides insight into the applicability of geometric scaling for dummy evaluation and suggestions for improved dummy biofidelity.