Although humans are born with the innate ability to learn language, they learn (a) particular linguistic system(s) as their native language(s) from elders in their community. In other words, language is socially transmitted from one generation to the next, and a child reared in isolation does not acquire language.
This is contrasted with a number of bird species which are born with the innate ability to produce birdsongs (at a particular age of maturity), without having to be instructed.