Anti-colic valve: the baby bottle is designed to keep air away from the baby's tummy during feeding, helping to reduce colic and discomfort Works like the breast: the teat releases milk when the baby actively drinks, compared to traditional free-flow teat, as like breastfeeding, it can take time for a baby to get used to it Natural latch on: the Philips Avent baby bottle teat helps the baby to latch on and feed comfortably Right teat flow: find your baby's perfect flow rate and personalise your Avent bottle, and easily switch between breast and bottle Prevents spills: the teat opening is designed to release milk only when the baby is feeding, so you can confidently avoid milk loss whether at home or on the go