My dd1, aged four and a half, has sucked her fingers since she was a baby. She mainly does it when tired, upset or poorly and also does it in her sleep. They look painfully red and sore sometimes. Her younger sister at the age of two is now starting to copy her which is really annoying an irritates her ezcma. Any advice on how to stop her sucking. I must admit, apart from the fact it looks sore, the main problem is me - it really bugs me and am sure it can't be good for her teeth, although the dentist hasn't mentioned it. She will stop when I ask her, usually, but she obviously finds it of comfort so not quite sure what to do. It's not a constant.