- Built-in valve flexes with baby's natural feeding rhythm and lets baby control the flow of milk, which can help reduce the risk of overeating and spit-up
- Valve also prevents a vacuum from forming in the bottle to keep air out of baby's tummy
- Reduces colic and gas after feeding
- Do not use Variable Flow nipples as an alternative to the Slow, Medium and Fast Flow nipples, as marking I is faster than the Fast Flow nipple. These nipples are not intended for babies who are already drinking independently
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