Baby fever shortness of breath may be related to metabolic increase, pneumonia, myocarditis and so on, the specific analysis is as follows: 1. Metabolic increase: generally in the fever easily caused by metabolic increase, respiration will be accelerated, the phenomenon of shortness of breath, generally in the body temperature back to normal, shortness of breath can be relieved. 2. Pneumonia: fever shortness of breath should be alert to pneumonia, pneumonia will affect the ventilation and ventilation function of the lungs, causing hypoxemia, thus causing symptoms of shortness of breath. 3. Myocarditis: the heart load will increase when you have a fever, which will lead to an increase in the lung load, causing shortness of breath. Baby fever shortness of breath may be related to other causes, it is recommended to go to the hospital in a timely manner for relevant examinations, to clarify the cause of the symptomatic treatment.