I realize that all babies are different & prefer certain bottles over others, but I kept all of DS#1 bottles & thought I'd at least try to see if DS#2 would take them also. I know I need to replace the nipples, but with the Dr. Browns bottles, do you need to replace the other internal parts too? When I bought the replacement nipples I didn't see the other parts at the store, so I just want to make sure I'm not missing anything. Thanks!

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Re: Reusing bottles question - Dr. Browns