If laughter is therapeutic, a baby's is worth two. Who knows why there are certain things that babies find so funny that they can't stop laughing, the important thing is that it is the clear demonstration that they are healthy and happy, and there is nothing more important than that.
In the next video you will see two twins taking a bath. If they're not adorable enough on their own, with their whole head full of foam, prepare to die of love when you hear them burst out laughing when splashing. What a relaxation!