Four to Six Months
As babies learn to push themselves up, roll over, and control their own movements, eye-body coordination develops. 4–6-month-old babies become skillful with their eye-hand coordination, able to direct a bottle into the mouth or grasp at objects freely. Their hands reach for most things they see; and they start to remember things they’ve seen. By the 4th or 5th month, babies' brains have finished learning how to fuse the pictures coming in from both their right and left eyes into a single image for full binocularity, or "two-eyed" vision with depth perception. A baby is able to reach for desired objects more accurately, demonstrating an improvement in spatial and dimensional coordination. Refining their eye teaming and focusing skills, they learn to look quickly and accurately between near and far distances. By the time a baby reaches 6 months of age, normal vision acuity is 20/20.