Ready to feed. Do not add water. Excellent nutrition (additional iron should be supplied from other sources) for babies 0-12 months. You can feed Similac Low Iron with confidence, provides calcium for your baby's growing bones. Designed to be gentle on your baby's developing digestive system. Breast milk is recommended. If you feed formula and need a milk-free feeding, ask your doctor. Same trusted Similac Low Iron Ready to Feed formula in a convenient package. Filled by volume 1 quart. Extra space in bottle allows for shaking and easy pouring.