Place these milestones in sequence from earliest to latest: rolling over, sitting without support, crawling, walking.

• A. Rolling over, sitting without support, crawling, walking
• B. Rolling over, crawling, sitting without support, walking
• C. Sitting without support, rolling over, crawling, walking
• D. Rolling over, sitting without support, walking, crawling

Answer: (A)

Gross motor development in infancy follows a typical progression as the body gains strength and balance. Rolling over is usually the first mobility milestone, helping the baby practice trunk control and coordinated movement. After that, sitting without support emerges as the trunk and neck muscles strengthen, enabling the baby to balance upright. Once sitting is established, crawling appears as the next step in independent mobility, requiring weight shifting and coordinated limb movement. Walking then comes as the final major milestone, with legs and balance mature enough for upright, unsupported steps. So the sequence from earliest to latest is rolling over, sitting without support, crawling, walking. Other sequences mix a later milestone before an earlier one or place walking before crawling, which doesn’t align with how these skills typically develop.