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Title: Hate these bottles
Review: If I could rate it a zero, I would. These bottles are a gimmick. When the baby sucks on the bottle, the air he releases into the bottle goes through the brown insert and up through the blue pipe. That's why you can't see the air bubbles. It actually makes air stay in the nipple longer causing the baby to suck more air if the nipple and ring haven't been screwed on well because the air gets trapped. This in turn makes for a frustrated baby because he is sucking and can't get milk.
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