Enfamil ProSobee is a 20 Cal/fl oz soy-based formula for the routine feeding of infants with feeding issues resulting from sensitivity to milk-based formula. Enfamil ProSobee is for babies with sensitive tummies when a soy formula is preferred. Enfamil ProSobee is lactose-free. Enfamil ProSobee is designed to provide a sole source of nutrition for infants up to age 6 months and provide a major source of nutrition through 12 months of age when indicated.