I apologize in advance as I am sure this question has been answered a multitude of times. My LO will be a year on the 24th of October. She still nurses 4 or 5 times a day. Do we also need to introduce cow's milk in a sippy cup or does she not need it because she is breastfed? Also, why would I not give her a sippy cup of my frozen breastmilk (I have a freezer full that will still be good)? I have googled and googled this and haven't been able to find anything on point. Thanks!!