Final answer:
Motor development in infants progresses from reflexive reactions to more advanced motor functioning, such as sitting, crawling, and walking.
Step-by-step explanation:
Motor development occurs in an orderly sequence as infants move from reflexive reactions (e.g., sucking and rooting) to more advanced motor functioning. For instance, babies first learn to hold their heads up, then to sit with assistance, and then to sit unassisted, followed later by crawling and then walking.