The present invention is directed to a novel method for increasing the production of acetate, decreasing the production of butyrate, increasing the population and species of beneficial bacteria and slowing the rate of fermentation of prebiotics within the gut of a formula-fed infant. The method comprises administration of a therapeutically effective amount of PDX to the infant.本發明係有關一種新穎的於食用配方的嬰兒之腸道中增加乙酸的產生、減少丁酸的產生、增加有益細菌的數量和物種數以及減緩益生素(prebiotics)的發酵速率之方法。該方法包括給嬰兒投予治療有效量的PDX。