Even the youngest babies have the capacity to communicate. Eye contact is one of the simplest forms of communication for babies. It makes them feel safe and secure and begins to create a bond. It also is the beginning of language development. When we make eye contact with babies and they make noises in response, they are learning how to verbally communicate their feelings and get a response from us.
Babbling is one of the beginning stages of productive language development. It is typical for babies to imitate sounds that they hear. To support normal language development you should talk to infants and encourage their babbling.