The Sassy Baby Food Nurser is designed to ease the transition from breast milk or formula to solid food. Unique vacuum disc keeps nipple full and air out. Baby Food Nurser Kit includes two 4 oz. nursers. Recommended for ages 6+ Months. Top rack dishwasher safe.Introduce baby food through a bottle * Control disc provides uniform food flow and prevents clogging * Unique vacuum disc works with baby's suction to push food forward and keep air out * Includes 2 food nursers and 2 nipple covers