Which Philips Avent Natural Nipple do I own?

Both the previous and new Philips Avent Natural Nipples are designed to look and feel like a breast, but only the new Natural Response Nipples are also designed to work like one, releasing milk only when your baby actively drinks.The Natural Response Nipple comes in 5 sizes, and they can be recognized by the following features:•    Slit on the tip of the nipple instead of a hole;•    Swirl design around the petals;•    Grey Philips Avent logo on the bottle.To check whether you have the older or new Natural Response Nipple, please refer to the illustration below.

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