Enfamil A. R. Lipil Ready-to-Use Milk-Based Infant Formula is intended for baby"s first 12 months. Do not add water. For babies who spit up frequently. Includes a blend of nutrients found in breast milk that are important building blocks for a baby"s brain and eyes. Experts agree on the many benefits of breast milk. If you choose to use infant formula, ask your doctor which formula is best for your baby. Enfamil AR Lipil was specially designed for babies who spit up frequently or whose doctor recommends a thickened formula.