Little one is driving me nuts. She keeps biting me even though she knows better. So she's had a sippie cup with milk all…

Little one is driving me nuts. She keeps biting me even though she knows better. So she's had a sippie cup with milk all day and only fed from the breast once, otherwise I've been pumping all day. Figured for bed she'd want the breast only to get bit twice and me angrily going downstairs to fill her sippie and for her to happily take that. I almost want to start cows milk because I'm always worried I won't pump enough to keep up with her (which I know is silly because I should still be producing the same amount either way). Just getting a little more irritated then I should be.