Add water. Excellent nutrition clinically shown to support brain development. 1st Choice of doctors. A unique formula clinically shown to - 1. Support brain development (visual and mental). 2. Provide 53% greater calcium absorption. 3. Provide greater bone mass and bone density. You can feed Similac with Iron with confidence - Clinically shown to support brain development (visual and mental) like breast milk does; Complete, balanced nutrition for excellent growth; Specially formulated to be gentle on your baby's digestive system; Ideal for supplementation. Breast milk is recommended. If you feed formula, the makers of Similac promise to deliver excellent nutrition you can trust. That means providing the right formula to help your baby grow up strong. 1st Choice formula for doctors. The right formula for most babies. Milk-based.