A growing body of research indicates connections exist between action, perception, and cognition in infants. In this study, associated changes between sitting ability and upright face processing were tested in 111 infants. Using the visual habituation "switch" task (C. H. Cashon & L. B. Cohen, 2004; L. B. Cohen & C. H. Cashon, 2001), holistic processing of faces was assessed in same-aged non- and near sitters (22-25 weeks) and same-aged new and expert sitters (27-32 weeks). U-shaped relation was found between sitting stage and holistic face processing such that only nonsitters and expert sitters processed faces holistically. It is posited that the results are due to a reorganization of the upright face-processing system resulting from infants' learning to sit independently and trying to incorporate the meaning of upright faces. (Contains 2 tables and 2 figures.)