I have a little grandson who was very ill for first few months of life and still has medical problems. He's had a dummy because otherwise his mum, who breastfed him till he was 1yr old wouldn't have been able to do anything. I'd never given my children dummies so the thought never occurred to me to suggest trying one for him, health visitor suggested it early on and it worked. So he was one of those tiny babies with a big dummy of whom you speak so despairing but it kept him happy when he would otherwise have been unhappy. He still uses it, he's nearly 15 months but we're not worried, he only gets it when needs it, will refuse it at times and it'll be much easier to stop him using it than it should if he sucked his thumb instead. His mum, 36, still sometimes ducks her thumb in her sleep when she's worried about things, I'd put money on my grandson not all sucking a dummy at that age!