Babies from 3 to 6 months do not use language. They create Nominal Combinative messages--almost.
In the case of parrots (and similar birds) their flexibility in acquiring sounds is surprising, and they may learn a number of calls made up of human speech sounds.
The difference is that the meaning inferred on the sounds by a human is not shared by the bird. Polly may look adoringly at another cute parrot and say "Polly wants a cracker." But food is probably not what is on his mind.
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To continue...A close fit for humans, in terms of nominal combinative, communication is the babbling of the infant from 3 to 6 months. It is nominal because it is instinctive.