Posting for traffic because I really need the hive mind/any doctors or nurses or medical professional/anyone with experience of this to tell me what the hell they think this is:
My son started today randomly crinking his neck, so that his ear touched his shoulder. Not a big deal, right? Except that at the same time his arm was pulling up and making a bit of a deformed claw with his hand. Every time. He is otherwise well but I emailed the paedatrician who has come back with quite an alarming email about needing to come in and see him ASAP. Not sure when he has availability waiting for an appointment but now DH and I are extremely worried about what this could be.