For Baby's First 12 Months. Do not add water. Easy to digest. 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 A.R. was specially designed for babies who spit up frequently or whose doctor recommends a thickened formula. Use as directed by your baby's doctor. Enfamil offers a complete line of formulas to meet your baby's unique feeding needs, for the first 12 months of life and beyond. We have been committed to infant nutrition and innovation for nearly 100 years.