First off for all the people saying that the bottom vent piece is defective. Read the instructions it says to wash and make sure the vent is open before using. Second don't over tighten the top because the nipple will collapse on you. Third and last I bought these first thru Walmart then bought the regular ones from a local grocery store and have been using them both a few days and can't tell the difference in gas in my baby so I'm giving them three stars. They work the same, one has more parts to clean!
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