The most important thing is to manage the diet, to ensure the normal nutritional needs and demands, and to arrange the meals reasonably, to avoid the baby’s partiality and anorexia. 2, to take the baby for proper physical exercise, which helps to strengthen the resistance. 3, to pay attention to family hygiene, especially hand hygiene, to prevent the baby from cross-infection or secondary infection. 4, for each disease of the baby, especially infectious diseases, should be sufficient, full course of medication, thorough removal of pathogens, otherwise the pathogen will become the focus of infection, resulting in repeated illnesses, affecting the baby’s resistance. 5, you can also take some immune enhancers, such as traditional Chinese medicine, including astragalus; can also take some probiotics to regulate the gastrointestinal function, such as Bifidobacterium.