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The teat is equipped with an anti-colic valve that lets out air which reduces air swallowed while feeding.. Features and Benefits:. The nipple has been specially developed to match the nipple from our BIBS Colour pacifier which promotes the right sucking technique for successful breastfeeding.. The nipple is produced from soft natural rubber latex and designed with an anti-colic valve.. Our bottle nipples come in three different flows: a slow flow, a medium flow and a fast flow.. Contains a milk lock for easy and hygienic storage and a funnel to fill up the bottle fast and easily.. We recommend replacing the nipple every 4-6 weeks.. Features both ml and oz measurements.