Infants with low immunity, conditioning methods include medication, appropriate light, adjust the diet, as follows: 1, medication: oral medication to improve immunity can be given, such as transfer factor oral solution, pidomod oral solution, spleen aminopeptide oral lyophilized powder, or lysine inositol vitamin B12 oral solution, astragalus oral solution, etc., but also pay attention to the supplementation of trace elements such as calcium, iron, zinc, etc., and appropriate supplementation of pediatric Vitamin D, conducive to the absorption of calcium; 2, appropriate light: sunlight exposure to the skin is one of the most conducive to the absorption of vitamin D; 3, adjust the diet: in daily life can be given a balanced, reasonable diet, not partial food, picky food, pay attention to reasonable complementary feeding.