Related to this question but from nutritional point of view.
Does microwave heating (not excessive) reduce human breast milk nutritional qualities?
Especially compared to conventional stove heating.
Never microwave breast milk -- overheating destroys valuable nutrients
Don't use the microwave for defrosting or warming, because it kills the nutrients in breast milk
My problem is that with microwave I get a more predictable heating result while with the hot water stove top heating I always overheat the bottle and need to wait till it cools down.