Inflicted Head Injury by Shaking Trauma (IHI-ST) can cause severe trauma in infants, where head kinematics during shaking are largely determined by the biomechanical properties of the neck. Physical models such as Anthropomorphic Test Devices (ATDs) are frequently used to study these injuries, making biofidelic neck models essential. However, data on infant neck biomechanics are scarce; existing surrogates have not been properly designed to match available data, and surrogate validation is largely lacking or inconsistently performed. This thesis addresses this gap by designing an infant neck surrogate with biofidelic stiffness and range of motion (ROM), alongside a test apparatus for its verification. The proposed neck surrogate utilizes stacked rolling contact joints pressed together by pre-tensioned leaf springs made of Grade 4 titanium foil. To verify surrogate performance under cyclic loading, a motor-driven crank-slider test apparatus was developed to replicate worst-case abusive shaking conditions. An OptiTrack motion capture system was used to evaluate sagittal flexion/extension (FE) and lateral bending (LB) ROM, static stiffness, damping, phase lag, and mechanical integrity under load. Although the surrogate satisfied sagittal FE ROM targets (reaching 118.2°) and matched target lower-bound stiffness corridors, it suffered mechanical failure during dynamic testing. With future improvements, such as asymmetric stops and stiffness elements, dedicated damping elements, axial limiting cables, and replaceable contact inserts, this neck surrogate can be developed into a highly biofidelic, durable component for infant ATDs, ultimately increasing data reliability in both biomechanical research and forensic investigations. ... Read more