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We're glad you asked. It took us a long time to get The Pop® perfect, and while we won't bore you with all of our ups & downs, the short answer is this: engineering. Defined, below.
That's right. The nipple was designed to only have a pullback when it takes a real tumble to the floor or the ground. Otherwise, if it falls on baby's chest or crib, the nipple will stay extended & ready for baby.