I posted a while ago about how Pippa sucks her fingers (exactly the same ones I used to, as a baby, apparently!) here, well now she has truly mastered the art.
Her fingers are straight in within a second of her starting to feel upset or grizzly. And now if her fingers on her right hand are inaccessible then the thumb on her left hand goes in. It never varies from that pattern....right hand, fingers.....left hand, thumb. So sweet!