I really notice it at meal times as I suppose he doesn’t have to sit still at other times (with me) much. He hangs off the seat, sometimes with his back on the chair and his feet on the floor on one side and his head dangling down, or turning upside down, or trying to climb on the table (!)
Obviously I do challenge him and don’t let him but no sooner have I told him to sit correctly than he’s hanging off the edge again.
I am really exhausted with it tbh, and wondering if it’s ADHD.