A unique nipple with air valve at the base, enabling a venting process, thus providing a smoother flow of liquid, thereby preventing against nipple collapse, colic, and spit up, burping, and gas. Simulates breast feeding thus making it easier to alternate between breast feeding and bottle feeding.Easy latch on. Odorless, tasteless, and guaranteed not to perish. Made from high quality medical grade silicone. Volatile and nitrosamine safe. feeding bottles baby products offer deals glass bpa free bottles mother best quality .
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