Final answer:
Infant motor development involves significant changes in gross and fine motor skills from reflexive responses to more complex actions like crawling and walking, usually following a consistent developmental sequence.
Step-by-step explanation:
Changes in Infant Motor Development
During infancy, there are significant changes in both gross and fine motor skills. Initially, infants exhibit reflexive responses such as sucking and rooting. As they grow, their gross motor skills advance from holding their heads up to sitting with assistance, followed by unassisted sitting, crawling, and eventually walking. By their first birthday, most toddlers can stand and walk with help. Fine motor skills also progress, enabling infants to perform actions like grasping objects with a pincer grasp, flipping through book pages, and handling small objects.
Infant development milestones unfold in a sequential manner. By ten months, a typical infant is able to sit unsupported, crawl, and show improved dexterity through activities like picking up objects with precision. Cognitive and sensory abilities are also rapidly developing, complementing motor skill advancements.
Overall, while age-specific milestones like sitting, crawling, and walking can vary in timing among infants, these milestones typically follow a consistent sequence that reflects the ongoing development and refinement of gross and fine motor abilities during the first year of life.