Freezing your milk basically puts a pause on the expiration of the product until it is thawed again. However, once frozen, it can be hard to remember when it was that you actually put the bottle in the freezer. It makes sense then to label the milk with the date of freezing. That way when it's thawed, you'll know how many days you have before it expires. If you want to make your life even easier, you can write on the number of days the milk has before it expires. Once it's thawed, you'll know it should be consumed within that window of time.
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