Milk-based with iron. Natural defense dual prebiotics. Clinically Proven (studied before the addition or prebiotics) Triple Health Guard: Growth; Brain & eye; Immune system. Trusted by mom & pediatricians. Do not add water. Just add nipple. Nipple not included. Enfamil has a line of formulas designed to meet your baby's changing nutritional needs. Enfamil Premium Infant has Natural Defense Dual Prebiotics for digestive health and provides three proven (studied before the addition of prebiotics) benefits: Growth: Growth similar to breastfed infants through 12 months; Brain & Eye: IQ & vision similar to the breastfed baby up to 4 years of age; Immune System: Helps support your baby's immune system. Experts agree on the many benefits of breast milk. If you choose to use infant formula, ask your baby's doctor about Enfamil infant.