My son is 4 and a half and he will have absolutely random outburst of yelling and moving his body around sometimes almost flailing .

An example would be he’s sitting there quiet for 30 minutes watching TV and then he will just start yelling . Not because he’s mad or yelling about anything in general it seems like it’s just an outburst and he’ll do it for 10 seconds sometimes up to 30 seconds and then go back to doing whatever he was doing . Usually it’s not words , it’s just yelling lol.

I was wondering if anyone else has experienced this and if it’s normal ? I’ve never seen it before and our daughter the same age doesn’t do it . I’d say it started about 6 months ago and now it’s maybe once a day or once every other day .