Bye~Bye bottles (bittersweet)

For the past week JB hasn't had a bottle (okay, I did sneak in a couple here and there just because I can't believe he is off them).
We introduced him to a sippy cup at 4 months old when we started giving him cereal/solids. We'd put in a bit of water and have him experiment with the cup. We have a few different brands and he'd sip out of all of them, but not take much of an amount. We'd give him water, watered down juice or his formula and again just sips.
He drinks from open cups at playgroup and sometimes at home, he likes to do this, especially blow bubbles into the cup.
So, I bought him these cups called trainer bottles from Green Sprouts (resembles a bottle a little more then I'd like, but for him who used Playtex bottles, it is quite different). He took right to them and drinks all his formula out of them. He'll cuddle up with us just like he did with his bottles and he loves the handles on these cups so he can get a good grip on them. Like I said earlier I'd give him a bottle here and there and he could care less about it...which I know is great and makes for a good time to just switch over without a fuss.
We'll be doing just that. I just can't believe our baby is going to be off bottles. I had planned on slowly weaning him to this cup and have him off his bottles at 1 year, but he took right to it without looking back. We'll keep giving him his formula in the trainer bottles and I have introduced him to some whole milk in his sippy, about 1 oz at a time with a meal.
So...Bye~Bye bottles, OMG!