Which stage of development covers the age range from birth to 1 year?

The age range from birth to 1 year is classified as the stage of development known as infancy. During this critical period, infants undergo rapid physical and sensory development, including significant milestones such as gaining motor skills, developing senses, and beginning early communication through cooing and babbling. Infants rely heavily on caregivers for their needs, which helps establish attachment and social development.

In contrast, the other stages correspond to older age ranges: toddlers typically span from 1 to 3 years, preschoolers range from about 3 to 5 years, and school-age children are generally from 6 to 12 years old. Therefore, the unique characteristics and developmental achievements associated with the infancy stage are specific to the first year of life, making it the correct choice for this age range.