replace baby bottles?

G
Are baby bottles supposed to be replaced? If so how often and why? Or does it depend on the brand? I never thought about this until I read a comment on here, just curious because I had my First Last year and used bottles(never microwaved) but I sterilized them regularly. I was planning on using these with my next baby due next month. Should I replace or can they be used but maybe just new nipples? Also they weren't used very much only for a couple of months when I was pumping. I exclusively BF. 

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