Pigeon Peristaltic Slim Neck Teat Y-Cut 2Pk is Pigeon's original nipple design. Research conducted on baby's oral development shows that baby suckles breastmilk by moving their tongue in a smooth, wave-like motion. This is called 'Peristaltic motion' and is the natural way a baby feeds. Pigeon teats have been designed to mimic and promote this natural sucking action. Pigeon teats will reduce nipple confusion between breast and bottle. Suitable for slim necked bottles.Â 'Y' size teat is a variable flow, cross-cut teat which opens depending on how hard the baby sucks, so it can be used from birth ongoing.