Hello - I'm not really sure what to do (or if this is even a problem) but my 4 year old is due to start school next year and still sucks his fingers and wants his "blanky" when he's tired. I don't really have an issue with blanky because he's happy to leave that at home when he goes to nursery etc. I'm more concerned about his finger sucking and I have noticed recently that if he doesn't have his fingers in his mouth he's 
found a toy car or a figure or something else to put in his mouth instead...any advice?