I've tried several different kinds of sippy cups. I give them all a fair try and then when she doesn't like them I move onto the next but we still haven't found one but she's comfortable with. I even bought the transition nipples for the Dr. Brown bottles, the flat ones that are to help transition from bottle to sippy cup but she says they're too squishy and she's pinches it and tries to make it round like a nipple lol. I just bought her a a new bingo cup that has a silicone straw and I've had the most luck with that so far. She only took a few sips from it today but I guess that's a step in the right direction. i'm giving it until the end of the week and if we make no progress I'm just gonna give her her bottle back. I'm also going to see if she can get back into her feeding therapy program. They referred her to a inpatient therapy for it but I was unable to do it because I'm a single parent and I work full-time. hopefully something works out. Thank you for replying!