Dr. Brown's Natural Flow Bottle Nipples 2-Pack - Narrow Neck Level 4 (9+ Months)
by DR. BROWNS
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Designed by a doctor in 1996 and patented in 1997, Dr. Brown's Natural Flow is the only baby bottle to feature an internal vent system that: helps preserve vitamins C, A, & E by minimizing oxidation of breastmilk and formula; provides positive-pressure vacuum-free feeding similar to breastfeeding; and helps reduce colic, spit-up, burping and gas...