Answer and Explanation:
First is very important to know that vision in babies, is something to be develop as other processes like walking, or sitting straigh. It will depend on the madurity of the brain. Since vision is part of the devevelopment, it has stages that are related directly with chronological processes.
For instance a new born isn´t going to be able to see objects crearly, his vision is going to be blurry. With time this would change. Within a few weeks with the development of the retine they would see the difference between bright and dark colors.
New born babies are not able to see through long distances, that is why it is important for adults to bring objetcts close to them so they can focus (it can be 8 to 10 inches from their sight.)
The ability of focussing vision will also accure within time, to grab an object requires focussing, and also eye hand coordination that wouldn´t happend in a baby youger that one month. When they turn one or two months approximatly they can focus their sight and grab and object that is in their midpoint of vision.
Litttle by little they would also develop better motor skills that will help them with the movement of the eyes to follow an object with their sight.
Al six months a baby would be able to see for long distance, can grabe this in their hands, Depth perception is going to appear at this age too.
The advice for parents is to respect the development of their babies, eventhough there is a theory that backs up development, each child is unique.
Paying: for the first months: come close to them so they can see you and play peek a boo at 8-10 inches from distance. Use objects of bright colors that would motivate their attention.
Tracking objects: when they are 2 or 3 months play with them to track objects with their eyes, by moiving a toy close to their midpoint of vision.
Six months they are able to grab an objetc in their hands and practice hand and eye coordination.
