Most adults don't recognize this when they raise their kids, soooo, my brain's been buzzing with how to write this up and spread the word. Learning language and communication is just like learning to walk. Exactly like it. Every time an infant moves its body, exploring what's possible in regard to motion in the world, it encounters a ground of some sort. In growth, it learns how and what to do in relation with the constancy of the generally flat smooth surfaces that are pressed against, interacted with, and call for certain motion behaviors in return, in that solid firmness underneath its body.
Language is the same thing, really.
Painstaking practice of crawling, toddling, walking, running is mirrored in establishing and building language skills. It puts off exposing the mind to associations it's ready to perceive even from birth. And, in the long run, if enough people perform these supports and exchanges over and over again with their children and students, whole societies will develop with new and earlier abilities, skills adaptative with a new appreciation for true human potential.