M.M.
I'm having the same problem with my 10 mo. old now. I have bought the Gerber, Dr. Brown's and Nuby sippy cups. She gives the Nuby cup the most chance, I think because its silicone spout is more like the bottle. She takes about one sip and is done with it though. I think frequent exposure will be the key. I have also heard that a straw works well...Sometimes we will put our finger over the straw to fill it and then drip a little water into her mouth...Good luck to you!!