Bottles turning yellow

Hi, my new born is just 2 weeks old, and i have been using my haenim 3rd gen uv steriliser to sterilise her bottles after every use. In about just 2 weeks, most of my bottles (avent, pumpables bottles) are turning yellow. Can anyone advise if the uv steriliser is causing the yellowing or whether i am sterilising too much? Do i have to sterilise after every use? Thanks!

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I am using the same steriliser and have researched on this before...apparently the yellowing of the bottles were caused by the UV light however it does not affect the quality of the plastic. However for your own comfort, if u find the bottles have turned too yellow, u can dump them and purchase new ones which is what I did :)

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