Hi J.,
I'm another advocate for the straw cup. None of my 4 ever went to a sippy cup. They were just confused by it. And with the cons of dental damage going through my head, I just opted for the straw cup. They all learned very quickly at 1 year old how a straw works. We just started with putting a straw in a cup of liquid, covering the top of the straw with a finger so the liquid wouldn't run out, and then giving them the other end to suck on while slowly letting the liquid out. It actually taught them very quickly that sucking on that strange thing gave them a drink. I may get some flack about this from other moms, but it was super easy for them to learn when there was something in there like a soda of some kind. However, our family really doesn't drink sodas much at all, so I've never actually put any in their straw cups for actual drinking. I do feel like straw cups are better for the teeth and much easier for the clean-up, as long as you can find one that doesn't leak. We tried our fair share of sippy cups, but the one that seems to work for us every time is the Playtex brand, and we use the "insulated sport" ones so things stay colder longer. Of course I always have to throw in a disclaimer, though. I really believe it's all individual, and in the grand scheme of things it really doesn't matter if your baby transitions to a straw/sippy cup at 12 months, 14 months, 15 months, whatever. It's just not at the top of my list of things to stress about! Good luck and God bless.