BOTTLE COMPATIBILITY: The Evenflo Feeding Balance Plus Standard Neck Nipple is compatible with the Evenflo Feeding Balance Plus Standard Neck Bottle. This set includes 6 Balance Plus Standard Neck Medium Flow Nipples and is recommended for babies 3 months and up NATURAL, GENTLE SLOPE: The unique, naturally-sloped nipple promotes a healthy wide latch for your baby by providing a proper resting place for their lips, helping to decrease mouth fatigue PREMIUM VENTING: Evenflo Feeding's patented Proflo venting technology is designed to keep milk bubbles in the bottle, not in your baby's tummy. This effective 1-piece integrated vent helps prevent colic, gas, and fussiness with no extra parts to clean or lose GULP-FREE FLOW: The Balance Plus Standard Neck Nipple is designed to with a slower flow for a calm, gulp-free feeding at baby’s pace OPTIMAL LENGTH: These Balance Plus silicone nipples are just the right length to stimulate your baby's soft palate and trigger their natural sucking reflex