I'm using MAM bottles and according to the user instructions on their website, it says we can warm milk in the MAM bottles in the microwave. I'm doing this by 15 seconds in the microwave, shake, and another 15 seconds in the microwave and shake again. I have a food thermometer and the temperature gets to about 35 degrees. However, hubby says that the important nutrients might get destroyed by warming in the microwave. Is this true? I'm confident that by shaking the bottle sufficiently, we shouldn't be getting pockets of hot milk, so I'm just concerned about losing precious nutrients. Does anyone have any thoughts on this? Thanks