Wide breast-shape nipple with a flexible spiral tip and unique comfort petals make the nipple softer and more flexible to promote natural latch-on Soft nipple design mimics the feel of the breast. Nipple's shape encourages the same tongue movements suckling babies use when breastfeeding. Made of soft, durable silicone, which is odorless and flavorless. Dishwasher safe Compatible with all Philips Avent Natural bottles Ideal flow rate for infants at least 3 months of age. Ergonomic shape