MNN - Mother Nature Network

Baby behavior is quite the dichotomy. If there's nothing more annoying than a baby crying, there's nothing that'll make you smile quicker than a baby laughing his noggin off. Something about a baby's cuteness combined with high-pitched laughter and innocence makes a baby's giggling infectious. It doesn't hurt that amusing them takes so little effort, making their laughter one of the most adorable sights in the world.

 

Of all the tittering babies on YouTube, these are some of the cutest. Go ahead and bookmark the article. Whenever you're having a bad day, just hit the link and watch a few of these videos. You'll be back in good spirits in a flash.

 

When's the last time you laughed when someone ripped paper over and over? Ah, to be amused by the simple things in life again...

 

This little guy is in such stitches that he actually starts crying a little bit. Still, you can't help but have a grin play across your face.

 

Watching a dog stuff its face with popcorn is somewhat entertaining in its own right ... but this rug rat thinks it's the funniest thing since "Seinfeld."

 

Even when a little chubster like this laughs but not rip-roaringly so, it's still endearing. Especially since he keeps squeaking all the while.

 

Whenever a baby just laughs for no apparent reason, you've got to wonder what they think is so funny. Of course, after you get over laughing with them.

 

What's better than one baby cracking up? A pair of them doing it in synchronized unison.

 

And what's better than twins laughing at the same time? How abour four of them?