Obstetric Brachial Plexus Palsy (OBPP) is a type of brachial plexus injury. Deformities and functional deficiency may occur in time because of muscle imbalance. The position and motion of the affected scapula may be different from those of the unaffected side. The aim of this study was to investigate scapular motions by three-dimension kinematic analysis during humeral elevation and at rest in three cases. The ages of the cases are 12, 14, and 11 years. Three-dimensional scapular motions were examined during humeral elevation using the Motion Monitor (R) Skeleton Analysis System after examining other demographic features. Scapular motions of all the cases included internal rotation, upward rotation and posterior tilt during humeral elevation and external rotation, and downward rotation and anterior tilt during humeral depression. However, there was no synchronization between the affected and unaffected scapulas. Scapular dyskinesia was observed in children included our study. To obtain clear data and to investigate the contribution to scapular dyskinesia of the muscles at the affected side, our study should be supported with studies including more cases.