How do Dr. Browns bottles actually work? I think they’re supposed to reduce air intake but how do they do that?
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When the baby sucks milk out of the bottle, that volume needs to be replaced with air. With most other bottles, the hole in the nipple will allow some air back, and bubbles will go up through the milk.
Dr Brown’s bottles have a valve that lets air into the colored tube. This lets replacement air into the bottle without making bubbles.
Personally, I felt that the claimed advantage of fewer air bubbles in the milk was less of an advantage vs the constant pressure of the baby always being able to get milk without having to fight the vacuum in the bottle.
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