Each bio-designed breast is expertly designed and uniquely shaped like a lactation nipple, medium flow, 2pk, mimicking the action of breastfeeding This will help avoid any confusion when combined lactation requires switching between lactation and lactation, ensuring a comfortable and effective feeding of your baby The baby's vital feeding nipple, such as feeding, has advanced anti-colic triple valves to reduce air intake. The Flexzone area around the nipple allows the nipple to stretch and bend just like the mother's breast, which means it's more comfortable and natural for the baby. Because babies grow very fast, we've designed a range of nipples with varying flow rates to keep up with your baby's growth. We offer: 0 m + slow flow 3 m + medium flow 6 m + fast flow For reasons of hygiene and safety, it is recommended to replace the nipples at regular intervals The size of the bottle and other nipple flows are available.