EASY OF USE - Screw onto standard-size bottles. Nfant nipples are not only the most consistent flow they are compatible with ready to use formula and most top selling bottles brands. QUICK TIP Overtightening can lead to leakage or nipple collapse if this happens, loosen your Nfant nipple. | FIND YOUR FLOW - Flow is unique to every baby. Each Nfant nipple is self-venting to allow the nipple to stay full of milk or formula while baby is feeding. | SAFE AND CONSITENT FOR BABY - Trusted by hospitals and clinically proven by independent research and studies. BPA plastic free. The most reliable nipple on the market with a controllable flow rate you can count on. Consistency in feeding is the key to baby's proper growth. | READY-TO-USE - Single use packaging for each nipple safe to use out of the bag. | DISWASHER SAFE-Load the nipple in the dishwasher for an easy clean or hand wash using warm, soapy water. Inspect the nipple for wear and tear after each use. | nfant APP: Get data-driven support and step-by-step guidance on responding to and adapting to your baby's feedings. | VERIFIED COMPATIBLE FIT - Our simple design fits on any standard baby bottle, including breast milk storage bottles. Compatible with Grad-U-Feed 60ml, Similac: Ready to Feed 2oz & Volu-Feed 60ml, Abbott: 4oz, Snappies: 2oz, Gerber: 5oz, Dr. Brown's: 4oz & 8oz, Sterifeed: 100ml & 250ml, Ameda: 4oz, Pigeon: 4oz, Nuby: 4oz & 8oz, Parent's Choice: 5oz, (No longer compatible with Enfamil's redesigned Ready to Use 2oz bottles)