Your legs might hurt but your baby will just want it more and continue laughing. Tickling: Whether it’s on their feet, stomach, or armpits, you can tickle babies to make them laugh.

Dr Caspar Addyman is an expert on babies' laughter. Hearing your little laugh is one of the best sounds in the world. But as well as being extremely infectious – did you know that their laughter ...

Yet baby laughter, a new study shows, differs from adult laughter in a key way: Babies laugh as they both exhale and inhale, in a manner that is remarkably similar to nonhuman primates.

This mom couldn't stop laughing during her ultrasound and the images from the monitor are incredible... and more hilarious than you imagine.