What does the "use by" date mean on infant formula product labels?

The "use by" date on infant formulas is a date, selected by the manufacturer based on tests and other information, to inform retailers and consumers about the quality of the infant formula. Until that declared date, the infant formula will contain no less than the amount of each nutrient declared on the product label and will otherwise be of acceptable quality. The "use by" date is required by FDA regulations on each container of infant formula.