Final answer:
The developmental milestones such as making eye contact, recognizing caregivers, and following a bright light with their eyes are initially observed in infants within the first year of life. These are part of the sensorimotor stage, which spans from birth up to about 2 years old.
Step-by-step explanation:
Developmental Milestones in Infants
Making eye contact, recognizing caregivers, and following a bright light with their eyes are developmental milestones initially noticed in infants, particularly within the first year of life. This age group is when babies start to develop a clear preference for looking at human faces and can communicate their needs. Over time, infants begin to recognize caregivers and show the ability to follow a bright light with their eyes. By six months, an infant's vision improves, and they start noticing colors and showing the ability to discriminate depth. Moreover, during the sensorimotor stage, which lasts from birth to about 2 years, and particularly in the first few months, infants develop and exhibit these critical visual and recognition skills.