Newborn babies sleep for about 16 - 18 hours a day. By the third month they can distinguish their mother by sight. At four months babies can grasp objects with their hands. At about six months of age infants respond socially to people; they have become emotionally attached.
By the end of the first year they have enough teeth to eat coarser foods. The average baby can walk after 12 months. At that time they are called a "toddler". Sleeping time becomes 9 - 12 hours a day by the age of 2 years.
Language is learned after one to two years. Infant's vision, on the other hand, gradually improves to 20/20 at five years. (20/20 is a common medical term used to convey perfect vision.)