The NEW Philips AVENT 4-ounce Natural bottle is the most natural way to bottle feed. The wide, breast-shaped nipple promotes natural latch-on so you can easily combine breastfeeding and bottle feeding. The unique comfort petals inside the nipple increase softness and flexibility without nipple collapse, and the innovative twin valve anti-colic newborn-flow nipple helps newborns feed comfortably and easily. The ergonomic shape makes it comfortable for parents to hold and easy for small fingers to grasp. Assembly is simple with only a few parts and the wide bottle neck makes filling and cleaning easy. This Natural Philips AVENT bottle is made from polypropylene, a BPA Free material, and works with all nipples and caps from the Natural line. Natural, Flexible Nipple Promotes Latch-On The included breast-shaped Natural newborn-flow nipple helps you combine breastfeeding and bottle feeding. Its natural shape promotes easy latch-on so your baby can feed contentedly and without interruption. Built-in unique comfort petals make the nipple softer and more flexible. The petals also reinforce the shape of the nipple to keep it from collapsing in your baby's mouth, ensuring smooth feedings. Dual Anti-Colic Valves Keep Babies Comfortable The nipple has twin anti-colic valves that help make feeding more comfortable for babies. During feeding, the valves release air back into the bottle rather than into a baby's tummy to reduce colic and discomfort. Ergonomic Bottle Is Easy to Grasp The Natural bottle's wide neck helps you pour breast milk or formula without spills and offers ample room to use a brush to clean hard-to-reach areas once your baby has been fed. The ergonomic 4-ounce bottle is comfortable for parents or caregivers and easy for babies to hold on to when they're ready. Fewer parts mean that assembling your baby's next meal is fast and simple. Clear measurements on the side of the bottle let you instantly know how much your baby has eaten. BPA Free Polypropylene Is Safe for Babies Natural Philips AVENT bottles are made of sturdy polypropylene, which is free of potentially harmful BPA. Polypropylene is also easy to wash and sterilize using any Philips AVENT steam sterilizer or by boiling. Compatible with All Natural Philips AVENT Bottles and Parts Like all Natural Philips AVENT bottles, this 4-ounce bottle works with other Natural Philips AVENT components. As your baby grows, you can switch between different Natural bottle sizes and nipples to meet your child's changing needs. The Natural Philips AVENT bottle works with all Natural Philips AVENT nipples.