Julian's new whiny sound

On Friday (6/12) Julian started exploring some new sounds while babbling in his crib. It started out as dadadadada and babababa and mamamama etc.... and then turned into the same sounds but whining and then I took this video on Sunday. The sound is gone now but he's still smacking his lips the same way and it's the funniest thing. (and the saddest face - i just can't help but laugh). And notice he doesn't like it when a friend takes his toys. And notice when i laugh at him, all of a sudden he forgets his whining and thinks he's funny.