Final answer:
Binocular vision, which allows for depth perception, begins to develop in infants around six months of age.
Step-by-step explanation:
Binocular vision, the ability to combine information from both eyes for depth perception, begins to develop in infants around six months of age. At this stage, their vision is almost as acute as adult vision and they start to notice colors. They may also show the ability to discriminate depth and may start to display anxiety towards strangers. The development of binocular vision continues throughout early childhood.