Dummies??

Ok my baby girl is nearly 7 weeks old and has a dummy the thing is she likes the cheap ones and they are very big so she chokes on them I went out before she was born and got Nuk and advent dummies she won't take them I even got the next size up as I know the teats on them are very small but she still won't take them but I want her to as they are better for her how would I get her to take the other dummies ?? Advice is appreciated