Sippy Cups  

Just keep offering the cup. 9 months is really not too old for the bottle. I would worry about switching around the age of 1. 9 months is a bit early to do an abrupt switch. The cup is something new and the little ones don't easily take to it anyway. Just keep trying.

Anyhow, I don't know much about the 'magic cups' but one of the problems we had with ours (we had a different brand, which I bought seven years ago and they lasted nicely until now our third one is done with them) were the flow stoppers, the thing that prevents spills when the cup is turned upside down. Because the little ones have to suck hard on that in order to get the milk out, they don't take that easily to the cup as you would think. We ended up taking them out for a while and just watching them and making sure they don't turn it upside down. Once they got used to the cup, we put it back in there. Ours were removable, not all brands have that. You can also buy training cups, which don't have a flow stopper.

Just give it time. And really, 9 months is quite early to switch and definitely not too old for the bottle. Introduce the cup slowly. She'll take to it eventually.