In which of the following periods does physical growth and development occur at a rapid pace ?

The correct answer is Infancy and early childhood.

Physical growth and development occur throughout human life, but the rate of growth varies significantly across different stages of development. The most rapid pace of physical growth and motor development takes place during infancy (from birth to 2 years) and early childhood (from 2 to 6 years).

During these early years, a child experiences remarkable physiological changes:

1. Rapid Weight and Height Gain: Infants typically double their birth weight by 5 months and triple it by their first birthday. Rapid increases in height and body proportions occur during early childhood.

2. Brain Development: The brain undergoes its most dramatic growth spurt during infancy and early childhood, laying the neural foundation for motor control, speech, and cognitive functions.

3. Motor Skills Acquisition: Children rapidly develop both gross motor skills (such as crawling, walking, and running) and fine motor skills (such as grasping objects and drawing) during this stage.

While adolescence also features a significant growth spurt (puberty), the relative rate of physical growth and overall developmental transformations in infancy and early childhood is the highest among all stages of human life.