Which of the following is considered a physical development milestone during infancy?

Crawling is considered a significant physical development milestone during infancy as it typically occurs between the ages of 6 to 10 months. This milestone represents not only a progression in motor skills but also a crucial phase in an infant's exploration of their environment. Crawling helps infants strengthen their muscles, improve coordination, and develop spatial awareness, allowing them to move towards objects and explore their surroundings independently.

While walking is also an important milestone that follows crawling, it generally occurs later, around 12 months or more. Running and jumping come even later and are typically associated with toddlerhood and early childhood development. In contrast, crawling is one of the first methods of mobility that infants typically achieve and signifies a growing physical capability and readiness for further exploration and interaction with their environment.