When it comes to the exact process that transforms the child's utterances into grammatically correct, adult-like speech, we can say the following:
Researchers still do not know what the exact process is. A lot of progress has been done when it comes to understanding how language acquisition functions, but not enough to know what that exact process is.
Several important psychologists and linguists have tried to figure out the mysteries of language acquisition over the past decades.
Some claimed it was a natural, intrinsic process, while others claimed that it was only learned through interaction with the external world.
A lot of progress has been made, and the influence of linguist Noam Chomsky is great to this day.
The general conclusion is that both nature (internal processes) and the environment (external factor) play an important part.
However, the exact process that transforms the child's speech into adult-like speech is still unknown.
Learn more about language acquisition here:
brainly.com/question/11412887