I never warmed up her milk, she preferred it to be chilled. So I needed to keep it cold even if we were going out for less than 2 hours (breast milk is fine for up to 2 hours out the fridge). If I was just going to be out for a short time, I packed her bottle bag with a round ice pack on the bottom and then a flexible ice pack wrapped around the bottle itself (search Lakeland flexible ice packs). If I was going to be out all day and needed to pump on the go, I took a larger insulated cool bag with lots of ice packs to keep everything cold. It can stay cold for up to 24 hours if you have a good insulated bag and enough ice! I stored the pumps and everything in there. Most cafes and restaurants will give you a cup of hot water for a baby’s bottle if you ask. My other mum friends usually did that if we were meeting up for coffee, or brought a flask.
Fresh pumped is good not refrigerated for 6 hours by uk rules I don’t reheat it he doesn’t care I have seen if you have it in a cool bag with ice pack it’s good for 24 hours Also have closed system wearable pumps that i can rinse with preboiled water and sterilise once every 24 Rules might be a bit diffrent in warmer climates but Brest milk is diffrent to formula and doesn’t have to be hot
I take a cool bag with me if I’m going somewhere that falls within feeding times. I store my milk in there. I also take a flask of hot water & a dish too to heat the bottles up. There may be an easier way than this, I’ve just not found it! 🫣