what is the life span of avent storage cups? how often should i discard & change?

If unused, it can be stored at a cool place. If u have used it to store milk then max 3 times sterilize n u have to throw. I stopped using to store milk but more for storing my children's biscuits etc. it is a better plastic quality but is still plastic so i don use it to contain my bm.

It is BPA free. http://www.mea.philips.com/c-p/SCF720_10/avent-avent-food-storage-cups I did not use it to store breastmilk. I used them to store puree food when kids were young. I think as long as the cups do not turn colour or damage, you can continue to use it.

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there's a life span?! I've been using my set for 2 months! and I sterilize after every use. I'm very concerned now... :/