How do children acquire language?

Do parents teach their children to talk?

No. Children acquire language quickly, easily, and without effort or formal teaching. It happens automatically, whether their parents try to teach them or not.

Although parents or other caretakers don't teach their children to speak, they do perform an important role by talking to their children. Children who are never spoken to will not acquire language. And the language must be used for interaction with the child; for example, a child who regularly hears language on the TV or radio but nowhere else will not learn to talk.

Children acquire language through interaction - not only with their parents and other adults, but also with other children. All normal children who grow up in normal households, surrounded by conversation, will acquire the language that is being used around them. And it is just as easy for a child to acquire two or more languages at the same time, as long as they are regularly interacting with speakers of those languages.

The special way in which many adults speak to small children also helps them to acquire language. Studies show that the 'baby talk' that adults naturally use with infants and toddlers tends to always be just a bit ahead of the level of the child's own language development, as though pulling the child along. This 'baby talk' has simpler vocabulary and sentence structure than adult language, exaggerated intonation and sounds, and lots of repetition and questions. All of these features help the child to sort out the meanings, sounds, and sentence patterns of his or her language.

http://lsadc.org/info/ling-faqs-lang_acq.cfm