Thumb therapy

Baby B has really taken to sucking her thumb when she gets upset and/or when she gets tired and needs to go to sleep, and it's been a very effective way of calming herself down. I know a lot of people have issues with babies sucking their thumbs or fingers, especially once they start cutting teeth (no updates on that front, by the way), but I think I'd rather her lean more toward her thumb than a pacifier if I have a preference. It is thought that this behavior is at least partially hereditary; I was a thumb-sucker, and The Husband was a finger-sucker. If she hadn't ended up with this behavior, I would have been very surprised. And, I have to admit, it's awfully cute when she does it.