Re: Bottle or sippy for cows milk?
It's totally up to you, I always felt weird with the idea of my kids getting anything other than my milk in their bottles. We went straight to an open top cup at the babysitter's house and a straw cup at home with Lilah. She was about 14 months old at the time. With Trixie we switched to the open top cup both places at 12ish months - she had my milk from an open top cup until the freezer stash was gone and then onto the cow's milk.
I still nurse, she just doesn't drink anything out of bottles.