Every time I introduce a new sippy cup, DS seems to like it for the first few times and then completely loses interest. We've tried Nuk soft spout sippy cup, then switched to a Dr. Brown's soft spout sippy cup (pictured below). From there, we went to the Dr. Brown's hard spout, which worked the longest. Then, after some suggestions from here on HB, we tried the Tommee Tippee soft straw sippy cup and the Tommee Tippee spill proof cup (pictured below).

Out of all of them, the best luck we've had has been with the Dr. Brown's hard spout sippy cup and the Tommee Tippee soft straw sippy cup.

DS was okayed for milk Wednesday and I've been trying to get him to take his regular formula in a sippy cup but he won't take it, no matter where I put it. He's totally balking and wants the bottle. If he won't take formula in a sippy cup, how can I convince him to take regular milk in a sippy cup?

Any suggestions on transitioning? Any other brand suggestions? He needs to learn to use a sippy cup and I want to transition him to milk!