The next day his wrist was still bothering him. He couldn't pick anything up and moving his thumb was painful so off to the doctor we went for x-rays. Yep, the child has his first broken bone.
He broke his scaphoid bone in his wrist so his thumb will need to be immobile too until it heals. The part of the bone that he broke doesn't get good blood circulation so his healing time will be longer than usual. He'll have 2 months in a cast then another month in a brace, best case scenario.
He's taking it all in stride and is in good spirits.