For Baby's First 12 Months. Do not add water. Advanced formula. No other formula is closer to breast milk. Experts agree on the many benefits of breast milk. If you decide to use infant formula, no other formula comes closer to breast milk than advanced formula Enfamil with Iron because it is closely patterned after breast milk - our Gold Standard. Enfamil offers a complete line of formulas to meet your baby's unique feeding needs, for the first 12 months of life and beyond. Our commitment and innovation for nearly 100 years has made Enfamil with Iron the Number 1 Selling infant formula in America.