In English, we adults like to say babies go "goo goo ga ga." In French, it's "areau areau." And in Mandarin, it's "ya ya." So do babies really babble with different sounds in different parts of the ...

"Adjusting our speech to sound smaller when we use baby talk may be a way to convey affect to the baby, by trying to sound like them," she said. "At the same time, it can also help them in terms of ...