7 month old shaking

Has anyone had any experience with their LO’s arms shaking randomly? I’ve read online in many places that this could be normal for children this young, as their nervous system is still developing. But I still can’t help but be a little worried about how frequently it happens. We’re currently out of the country for vacation and plan to ask at his next check up when we get back in about a week’s time. But can anyone share your experiences with this??