Scientifically proven by science, Motscroises.

I do this. I do it every day, to my brother who is nearly 17. Having a mental disability helps, but it definitely makes him happier than if you just talk normally. Being silly = making babies/animals/my little brother happy. So why not eh? "What's dat! Oo what's daaat!? Oo! It's gone! Nope, here it is!" *Cue laughter*