Enfamil PREMIUM now has Natural Defense Dual Prebiotics We"ve improved the formula you trust to make it even more beneficial for your baby. Improved Enfamil PREMIUM with a unique, dual prebiotic blend, now promotes the growth of good bacteria throughout more of your baby"s digestive tract than our previous formula. Designed to act more like breast milk, our new dual prebiotic blend now works longer in the digestive tract for more complete support compared to our previous formula. Prebiotics feed the good bacteria, found naturally in the digestive tract — where 70% of your baby"s immune system is located. And emerging science suggests prebiotic may support your baby"s developing immune system. With Improved Enfamil Premium you can give a formula designed to help support your baby"s natural defenses.