hello!! my girl is 6 months old, I'm planning to start introducing her sippy cups. I bought the ones with rubber straws. she will hold and bite the straw(lol), and suck a lil. but not much! she manage to drink once tho.. hahaha. how do I teach her how to suck from the sippy cup? oh, I intro sippy cups now because my girl she don't want to drink from bottles... very headache. happy she drink a bit, not happy she don't even want it near. sighhhhh.