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This is true, but more of a CYA than a real issue. Becuase of the fats in the milk, it CAN heat up unevenly, but by the time it leaves the microwave and gets to the kid (unless the kid is IN the microwave with the bottle), it's going to redistribute. You shouldn't put it in for more than 15s or so regardless. *shrug
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Actually what'll happen is the water can get superheated (above boiling point) if it does not have a defect in the bottle in which to form the bubbles around. If this happens any form of pressure or any agitation can cause explosive boiling in which one bubble allows the form of multiples and the superheated liquid will explode in superheated steam.
The same thing happens if you put a flawless glass filled with water into the microwave.