J.H.
We're working on the same thing - I started with bottles of 1/2 cow's milk, 1/2 breastmilk, slowly decreasing the amount of breastmilk. He's now getting about 90% cow's milk (I'm still pumping a little at work so use that for his bottles). We've also just introduced straw cups (Playtex Twist and Click are our favorite but the Nuby ones are good too), and have been giving him juice/water mix in those. I hope to transition to all cups (no bottles) over the summer. I figured one big change at a time was enough for us (breastmilk to cow's milk first), but hope to be on cow's milk and straw cups by the end of the summer.