It seems diapers don't expire because they are paper products.

Here is a reply from Pampers to a similar question:
I'm sorry for any confusion with an expiration date in or on our Pampers diapers and training pants bags. This is the date our new Pampers Gifts To Grow program ends. (To learn more about this new rewards offer, visit http://us.pampers.com/en_US/gtgHome.do) It doesn't mean the product expires. In fact, In general paper products do not have a specific shelf life. However, to ensure the best performance, we recommend our diapers be kept in a shaded, dry storage area where the temperature is 85 degrees or less. Extreme heat or humidity could effect their performance. Also, if diapers are more than 1.5 years old, they may change surface color, but the product's safety and performance will be as great as ever.
Source(s):
http://www.onceuponalife.com/forums/archive/index.php/t-21069.html

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