Your baby’s health depends on carefully following the instructions below. Proper hygiene, preparation, dilution, use and storage are important when preparing infant formula. Powdered infant formulas are not sterile and should not be fed to premature infants or infants who might have immune problems unless directed and supervised by your baby’s doctor. Ask your baby’s doctor which formula is appropriate for your baby. Ask your baby’s doctor about the need to use cooled, boiled water for mixing and the need to boil clean utensils, bottles and nipples in water before use.