Similac Sensitive Infant Formula with Iron is a a nutritionally complete infant formula for your baby's first year that is an alternative to standard milk-based formula. It is used for mild tolerance symptoms such as fussiness and gas due to lactose sensitivity. This exclusive formula features OptiGRO which is a blend of DHA (docosahexaenoic acid; Omega 3) and ARA (Omega 6) for brain and eye development; calcium for strong bones (no palm olein oil); nucleotides to help support the immune system; prebiotics to help promote digestive health; carotenoids naturally found in breast milk; lutein to support eye health; Vitamin E to help support developing cells; and a blend of two carbohydrates to help maximize absorption and minimize malabsorption risks.