Similac 4 is milk for kids aged 3 years +. It is fortified with Eye Q Plus (a unique combination of nutrients including DHA, choline and Iron) and Immunity system (scientifically developed with prebiotics and antioxidant vitamins A, C & E). Similac 5 is great tasting and designed to fit the child’s growth needs during this important stage of development. Now it is also available in a tetra pack in 2 exciting flavors- Vanilla and chocolate.