Tan, it IS an issue with formula too, due to the uneven heating. And as Sam said, the kitchen's are separate to where the kids are and there have to be child proof doors or gates so the kids can't get in. Also, they are not allowed to take a child in there - ie go in there with a baby in their arms. So there is no risk to the child of using warm water to warm the milk. There is a greater risk of burning a child by heating their drink in the microwave.

I don't think using a microwave is common practice, although obviously some centres do. Jack has been to two centres and neither used a microwave to heat drinks - food yes, but not drinks.