It cooks unevenly in the micro And the plastic from the bag melts into it. You have to slowly warm it on the stove top in a pot of water making sure the bag doesn't touch the sides or bottom or the bag will melt.
You warm the bottles in water
OMG I just give it to her room temperature, like I have a gallon of water I buy at stores and wash the bottle and put the water in there followed by formula then give to her. Should I be warming it up first?? She drinks it all fine.
Go to Medela's website and they tell you how to store and thaw milk.
Get a bottle warmer. Test it before you give it the baby. And if you do use the microwave warm water in a mug and then set the bottle in it. I had to use FORMULA with my first and my mom taught me all about it.