Why is unopened powdered baby formula considered not sterile, while its liquid counterpart is? And why can’t the powdered version be treated and sterilized prior to distribution?
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Apart from what others have said, it’s more that the liquid version NEEDS to be made sterile during production to be safe, while the powder doesn’t. Sugars and nutrients in water sitting on a shelf make fantastic food for growing bacteria, so you need to make sure it doesn’t have a single speck of microbe before you ship it out of the factory. It’s much, much harder for bugs to grow in dry environments, especially with high sugar content (dry sugar sucks the water out of things like bacteria), so you can let dry formula sit on a shelf without issue. However, once you add water to the powdered formula, you need to use it pretty quickly to keep it safe.
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