Girls, could you please tell me if your kids have had something like t…

Girls, could you please tell me if your kids have had something like this? Or do you know about it: My child is one year old, somewhere around eight months old he started shaking with emotions, that is if he gets angry, or happy, or any other emotion. He seems to be in a seizure-like state lasting about three seconds, clenches fists and shakes all over. Sometimes he just does it randomly, like "yysyyysyy". And then lets go. More often he does this when he doesn't like something or gets angry. But I repeat, maybe he just does it randomly. We don't have any deviations, we've seen a neurologist, everything is normal.