Final answer:
Binocularity is normally present by 3 to 4 months of age when infants show improved color perception and begin to discriminate depth.
Step-by-step explanation:
Binocularity, which refers to the ability to focus on an object with both eyes creating a single visual image, is normally present by 3 to 4 months of age. At this developmental stage, infants begin to demonstrate significant improvements in vision. Their color perception improves, and they start to show the ability to discriminate depth, a critical component of binocular vision. By six months, they enjoy more interactions, indicating continuous visual and cognitive development.