In the course of clinical practice, many parents will raise their concerns, some of which are more representative, such as the parents’ own history of asthma, or their own babies have milk fungus or eczema, or their babies have already had one wheezing episode or allergic rhinitis conjunctivitis, etc.; there are also some babies with recurrent respiratory infections, whether they will develop asthma over time, and how to prevent it. This is actually a question of early prevention and control of allergic diseases (asthma, allergic rhinitis conjunctivitis). Some babies are not diagnosed with asthma, but have an underlying “constitution” for asthma, commonly known as “allergies”. They are much more likely to develop asthma than other babies, but not necessarily. What parents should do is to take some early steps to reduce the chances of developing asthma. If one of the parents is asthmatic, the likelihood of the next generation having asthma is 30 to 50 percent; if both parents are asthmatic, the likelihood of the next generation having asthma is 80 percent or more. However, many children with asthma do not have a family history of asthma, and children with a family history of asthma can be free of asthma attacks. It is evident that the occurrence of asthma is also influenced by external factors, especially the environment. More than 80% of childhood asthma is associated with respiratory allergies, especially some indoor allergens, such as dust mites and pet fur. Many studies have confirmed that one to two years after birth is a critical period for allergy formation, and if there is a high concentration of the above-mentioned allergic substances in the air, babies in this age group are prone to respiratory allergies after repeated inhalation. Therefore, this period is the focus of prevention and control. Allergic substances in the room should be reduced as much as possible, such as not keeping pets, not using carpets, cleaning bedding regularly, and promoting indoor air circulation. The newborn baby’s living space should avoid the stimulation of various harmful odors, including excessively strong perfumes, mosquito incense, paints, cigarettes and other smells. Avoid the impact of outdoor motor vehicle exhaust on the interior as much as possible. The effect of food allergies on the development of asthma is currently unknown. Infants are prone to food allergies, mainly in the form of facial milk fungus, because their gastrointestinal tract is not yet functional. As they get older and their gastrointestinal function becomes more robust, food allergy symptoms will gradually subside. The degree and duration of eczema reflects the strength of the baby’s “allergy” and the likelihood of future respiratory allergies, but it is debated whether avoiding certain eczema-causing foods can reduce the development of asthma. It is important to avoid blind food control as this may affect the nutritional balance. Unlike bacterial infections, viral infections are an important factor in promoting respiratory allergy. In economically developed areas, viral infections predominate; whereas in less economically developed areas, bacterial infections predominate. It is now known that bacterial infections can inhibit respiratory allergy formation, which may be one of the reasons for the lower incidence of asthma in rural areas and the higher incidence of asthma in urban areas. In conclusion, for babies with genetic or “allergic” conditions, attention should be paid to several aspects, especially environmental control, to strengthen their own resistance and reduce respiratory viral infections.