I bought a portable milk warmer
I don’t warm them.
My girl drinks my expressed milk at room temp x
Breastmilk can be stored at room temp for 4-6 hours so no just store and feed at room temp, no need to warm
We used inoby, is a warming machine
Use breast milk bags and then warm the bag under the hot tap in any bathroom. In restaurants I ask for a cup of hot water. Not boiled.