What key developmental stage occurs from birth to two years?

The key developmental stage that occurs from birth to two years is known as Sensorimotor Development. This stage is characterized by infants learning about the world primarily through their senses and motor actions. During this period, they explore their environment through touch, sight, sound, taste, and movement.

One of the major accomplishments of this stage is the development of object permanence—the understanding that objects continue to exist even when they cannot be seen, heard, or touched. Infants also begin to understand cause-and-effect relationships through their interactions with the environment, which sets the groundwork for further cognitive development in later stages.

In contrast, Concrete Operational Development pertains to ages seven to eleven, focusing on logical thinking about concrete events. Pre-Operational Development occurs from ages two to seven and is characterized by symbolic thinking and egocentrism, but it takes place after the sensorimotor stage. Fetal Development refers to the stage of growth and development before birth, which is not applicable to this timeframe. Therefore, the focus on sensory and motor experiences makes Sensorimotor Development the correct answer for this age range.