The specific causes of recurrent respiratory infections in babies are as follows: First, their own factors, babies due to the age of small, immune function is not yet perfect, or after repeated respiratory infections lead to a gradual decline in the child’s immune function, more prone to respiratory infections, which is caused by a decline in immune function. Second, improper parental care, parents do not according to the change in environmental temperature and weather temperature changes in a timely manner to the baby clothing increases and decreases, so that the baby is cold after a cold caused by recurrent respiratory infections. Third, parents often take their babies to public places with poor air circulation, such as playgrounds or supermarkets, which can easily lead to cross-infection and cause infectious symptoms in babies due to the lack of indoor air circulation, and try to take outdoor activities in daily life to avoid babies going to places with poor indoor air circulation, otherwise recurrent respiratory infections are likely to occur.