t is important that the mother use an appropriate and correct language and not "baby" because it would slow the evolution of it. For example: the logical and correct is to say dog and not wow wow.
The language is fed back through the stories, songs, rounds, etc. that the infant listens to so that in a determined time the speech is achieved. Remember that speech is the concrete use of language by each individual. Finally, the mother tongue becomes a vehicle for linguistic communication.