My DS is 10 weeks and has just started sucking his thumb when soothing himself to sleep. I'm worried about this becoming a long term habit that will be difficult to stop. I'm a teacher and have taught many junior age children who still suck their thumb with constantly soggy fingers and cuffs, much to their parents despair. He is EBF but will also take expressed milk from a closer to nature bottle. Should I introduce a dummy to stop the thumb sucking or risk the habit not being long lasting? Any experiences would be great, thanks x