Level 1. 3X 4 OZ (120 ml) Natural flow. Clinically proven to reduce colic spit-up, burping, and gas. Use with or without vent. Designed to grow with baby. No.1 Pediatrician recommended. Fits most breast pumps. Narrow. Internal Vent System: (1) Air enters the bottle collar and routes directly through the internal vent system. (2)The air channels through the vent tube, bypassing the milk, to the end of the bottle. (3) The vent prevents aeration of the milk, vacuum pressure and nipple collapse.
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