A very interesting talk from ted.com about how babies learn to speak.
Quotes:
"Six years ago, my wife and I, speech and cognitive scientists respectively, wanted to understand how a child learned language comprehensively and naturally, since most theories on language acquisition were grounded in surprisingly incomplete observational data."
Quotes:
"After transcribing several million words of speech, one of the first magical glimpses we got into the data was the acoustic equivalent of a time-lapse video of a flower blossoming. We were able to hear the evolution of a word form as my son transitioned from saying "gaga" to "water.""