What is an expected physical assessment finding for a 6-month-old infant?

Assessing infant development requires applying knowledge of gross motor milestones and the cephalocaudal progression of muscular control. The practitioner must differentiate between abilities typically acquired at the six-month mark versus milestones expected during later infancy or toddlerhood. Choice A rationale . By six months, infants have developed sufficient trunk strength and coordination to roll from prone to supine and supine to prone positions. This milestone indicates appropriate musculoskeletal development and integration of primitive reflexes necessary for future mobility. Choice B rationale . Standing while holding onto furniture, known as cruising, is a milestone typically achieved between eight and ten months. At six months, an infant generally lacks the lower extremity strength and balance required to support their full weight while standing. Choice C rationale . Sitting without support is a milestone usually mastered around seven to eight months of age. While a six-month-old infant can often sit with support or lean forward on their hands, independent sitting requires further core stability and balance. Choice D rationale . Independent walking is a major milestone typically reached between eleven and fifteen months. Walking requires advanced neurological maturation, complex balance, and significant muscle strength that a six-month-old infant has not yet physically or neurologically developed to perform.