I breastfeed my first for 1 yr & 10 months. Never used a bottle or anything my baby didn't take it. Soooo, I'm new to the bottle system. Baby #2 does take the bottle and I'm just breastfeeding and pumping :) question is how do I go out and take care of my milk? Ice bag? What if I pump? How do I store it and then warm it up? Please help?