Twenty years after “Look Who’s Talking,” there still seems to be no limit to the public’s yen to see babies who talk and act like really hip adults. It all may have started with the 1989 comedy “Look ...

What’s more fun than watching a cute, chubby baby giggle uncontrollably? A quick check of YouTube shows thousands of videos with babies laughing. Laughing at dogs, cats, their parents, other babies, ...