The Philips Avent Natural Bottles feature a wide breast-shaped nipple with a soft feel that mimics the shape and feel of a breast. Features an anti-colic valve and the Natural Response nipple lets your baby control the pace of the milk flow. 3-pack of bottles gives your child a natural way to bottle feed. Wide breast-shaped nipple with a soft feel that mimics the shape and feel of a breast so your baby can control the flow of milk like they do when breastfeeding. The nipple's unique opening and tip only releases milk when your baby actively drinks. Nipple has a no-drip design which helps prevent lost milk from the tip. Advanced anti-colic system with twin valve design vents air into bottle instead of baby's tummy. Ergonomic shape makes it comfortable for parents to hold and easy for small fingers to grasp. Polypropylene/silicone. Dishwasher safe - top rack. 11 oz. capacity each. BPA-free. Imported.