The present invention provides an infection protection agent that improves infection in infants, particularly infants that have just been born, and has no side effects. The present invention relates to an infection protective agent for infants containing bifidobacteria.本発明は、乳児、特に出生後間もない乳児の感染症を改善し、副作用がない感染防御剤を提供する。本発明は、ビフィズス菌を含む乳児向けの感染防御剤に関する。