100% PP Feeding Bottle, BPA Free, Liquid Silicone Teat with advanced anti-colic valve, Wide based Grooved Nipple helps Natural latch-on, No Nipple Collapse, Ergonomic Bottle shape, Anti-colic valve: The baby bottle is designed to keep air away from the baby's tummy during feeding, Works like the breast: The teat releases milk when baby actively drinks, this is different from the traditional free-flow teats. As with breastfeeding, it can take time for a baby to get used to this., Natural Response nipple: The unique Philips Avent bottle nipple opening only releases milk when the baby actively drinks., Natural Latch: Encourages easy switching between breast and bottle., The lightweight design makes it easy for your baby to hold and suck on, while the smooth surface makes it simple for parents to clean and maintain, No-drip nipple design prevents spills and lost milk, Dishwasher Safe: Easy to clean and maintain., BPA Free