Anyone come across this- he?s just about to turn 4 months and has been sucking his thumb since 8 weeks. This for us has been a godsend as he can settle himself and has been sleeping well at night. Now it all gone wrong. I think he may be starting to teeth as there is lots of drool and he?ll gnaw on things (my finger his fist). But weirdly at the same time he can?t/won?t suck his thumb. The combo means I was up most of the night. Just wondered if this has happened to anyone and if they relearnt this essential skill!