A method for the prevention or treatment of infections contracted by newborns of livestock mammals, which includes applying a composition that includes a mixture of bacterial strains to the perineum and/or the teat(s) of female livestock mammal that is going to give birth or has given birth to the newborn livestock mammals. Also, a kit for preventing digestive, respiratory or other infections in newborn livestock mammals, which includes at least one composition and at least one application element for applying the composition to the perineum and/or to the teats of the female livestock mammals.