According to Adolph, Weise, and Marin (2003), “Motor development refers to changes in children's ability to control their body's movements, from infants' first spontaneous waving and kicking movements to the adaptive control of reaching, locomotion, and complex sport skills”.
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Adolph, K. E., Weise, L., & Marin, L. (2003). Motor development. In L. Nadel, Encyclopedia of cognitive sciences (pp. 134-137). London: Macmillan-Reference