Nipple wide-neckMininor silicone nipples fit all bottles from Mininor. The nipples have an anti colic air valve, which reduces the risk of air intake, which is more likely to cause discomfort in babies with colic. The anti colic nipples are designed to reduce the amount of air that a baby ingests, while feeding. This can help to prevent gas buildup in the baby's digestive system. This special valve also ensures that the baby can use its natural sucking technique