The formula of the invention, intended both for infants and young children, comprises at least one LC-PUFA and at least one probiotic.The invention also pertains to methods of strengthening natural immune defences and promoting a healthy mental development in infants or young children by fully or partly feeding them with the said formula.本發明之配方係用於嬰兒和幼兒,包含至少一種長鏈多元不飽和脂肪酸(LC-PUFA)以及至少一種益生菌。本發明亦關於在嬰兒或幼兒身上利用完全或部分餵食他們該配方以強化免疫防衛和提升健康心智發展之方法。