How old is your baby? You can put your baby in a sidesaddle position in the Ergo, with bum in the middle, legs together out one side, and nurse that way if your baby is still on the little side. If she's bigger and can nurse sitting up, then you just drop the straps down and nurse in a vertical position.
Ergo is the _only_ carrier that DD will reliably nurse in. Can/have done it in RS and pouches and wraps, but in Ergo she will actually focus and nurse. Much less popping off to look around. Added bonus, she is able to access either side easily (not true in RS or pouch), and since she is a big switcher, 5-8 switches per session, that is A Big Deal.