DD is 19 months and still has a bottle before bed. I am trying to stop it as I worry about her teeth, so the plan was to try and encourage her to have a cup of milk with books/bath. So, DD and I went shopping and she picked out a new cup, seems very pleased with it etc. But, it is one of those straw ones. She can't work out how to drink out of it. She is used to a bog standard tomee tipee freelow beaker thing. So, what is the trick to get her drinking out of it? (I have tried showing her and nearly puked on the warm full fat milk)