The present study was conducted to define the developmental scope of movement in the three-month-old infant during grasp. Previous investigations have emphasized specific skills rather than kinesiological function. The systematic identification of the movements associated with the normal child's prehensile activity has yet to be shown. In the present study, specific movement interrelationships of the head, trunk, and upper extremities during grasp were identified. A fuller understanding of the normal child's motor behavior will provide researchers and practitioners with an objective baseline that can help identify abnormal prehensile activity. © 1984 Informa UK Ltd All rights reserved: reproduction in whole or part not permitted.