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I have about half dozen gently used (between 3-6 months old), sterilized Dr. Brown bottles with all parts - 2 8oz bottles, and several 4 oz bottles. We used these with our infant daughter, and they worked great - hardly any gas issues.
We decided to switch to glass bottles due to the uncertainty over BPA used in the bottles. Some people claim its ok, some people, not. If you want to read more about BPA, check out this link: