Ready to feed. Do not add water. DHA/ARA. No 1 brand fed in hospitals. For food allergies and colic due to protein sensitivity. For babies needing extra TLC. Filled by volume to 1 quart. Extra space in bottle allows for shaking and easy pouring. Alimentum contains a milk protein that is broken down into tiny pieces to virtually eliminate allergic reactions in most babies allergic to cow's milk protein. Breast milk is recommended. If you choose to use infant formula, the makers of Similac have a formula that's right for you.