Final answer:
By six months of age, infants should be able to fix on and follow a target. Their vision is almost as acute as adult vision, and they start to notice colors and show depth perception.
Step-by-step explanation:
Around six months of age, an infant is normally able to fix on and follow a target. Their vision at this age is almost as acute as adult vision, and they start to notice colors and show the ability to discriminate depth. This is also the age when they can pick up objects and transfer them from hand to hand.