My little Houdini of a boy keeps escaping from his car seat while I am driving. He can't actually climb out of the seat but he can get his arms free so he can reach the window and the door handle (thank God for child locks!). I have purchased one of those add-ons to the car seat belt but he has worked out how to get out of that as well. Getting very frustrated because a 25min car trip now turns into a 65min car trip constantly pulling over. HELP!