You might have seen those heartwarming and often funny viral videos where parents or caregivers engage in long "talks" with ...

Before babies learn to talk in a real language -- say English or Spanish -- they babble and coo, playing with sound. That's baby talk, and baby talk sounds similar the world over. Babbling and ...

You might have seen those heartwarming and often funny viral videos where parents ... or seeming to talk back. In one, the baby appears to reply in an accent strikingly similar to their carer ...