What visual development milestone is typically achieved at 2 months?

At 2 months of age, it is common for infants to achieve the milestone of following a person (or an object) as they move across their field of vision, typically up to 180 degrees. This indicates that the infant's visual tracking and attention are developing, allowing them to engage more with their environment and the individuals around them. This ability to follow a moving person not only reflects the maturation of the visual system but also plays a significant role in fostering social interactions, as infants become more attuned to the faces and movements of caregivers and others.

The other milestones mentioned, such as tracking an object through 180 degrees or a well-developed pincer grasp, occur at different ages. For instance, more advanced visual tracking generally develops later than 2 months, and the pincer grasp isn't typically seen until around 9 to 10 months of age. Smiling in response to external stimuli, though emerging around this age, is usually not as consistent and purposeful as visual tracking abilities. Therefore, the ability to follow a person for 180 degrees is the most characteristic and relevant developmental milestone for infants at 2 months.