The Q-series of child dummies is a new family of advanced child dummies covering the complete child population up to 12 years. The Q-series' design is not only advanced in terms of its biomechanical basis, it is also developed to be used in both front and side impact making it the first “multi-directional” series of (child) dummies. This paper presents the functional targets for the Q-series, a set of biomechanically based design and performance targets for a 3-year-old dummy and the validation of the prototype version of the 3-year-old Q-dummy, the Q3.