Yep, your milk should take precedence over all other fluids for now. I introduced a sippy at 6 months becasue Lilah never took a bottle and I thought maybe I could go out or something if she could drink from a sippy, but she didn't really "get it" until about 9 months, at which point she was only nursing 4 times a day anyway. So if you want to try a sippy, you can give small amounts of water, but your breastmilk is not only enough, it's still the most important food for you ds.