Each pack comes with 2 silicone nipples designed to most closely mimic natural breastfeeding. Our naturally shaped, soft, silicone nipples are ideal for babies who have trouble transitioning from nursing to bottle-feeding. Each replacement nipples also have two truly innovative vents that are built in to prevent colic, while totally eliminating leaking issues. Variable Flow (Y-Cut) 6+ months (thicker fluids) .
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