There is no easiest way to determine otitis media in infants. Doctors usually combine the symptoms, otoscopy and eustachian tube examination, hearing test, blood test, and CT to make a comprehensive judgment. 1. Symptoms: Infants can’t express their feelings through words. They usually have symptoms such as rubbing the ears, running water, bleeding or pus from the ears, redness and swelling of the ears, and crying, which may be accompanied by fever and vomiting. 2. Otoscopy and Eustachian tube examination: Through otoscopy, one can see the congestion, swelling, invagination or bulging of the tympanic membrane, loss of luster and color change of the tympanic membrane, and restricted movement of the tympanic membrane can be seen through the examination of the eustachian tube. 3. Audiological examination: through the acoustic impedance map can find the fluid in the tympanic chamber and hearing loss, which is important for the diagnosis of secretory otitis media and eustachian tube insufficiency. 4. Blood test: otitis media caused by bacterial infection can be seen as elevated white blood cell and neutrophil counts. 5. CT: CT examination can show the scope and severity of the lesion through the density shadow of the soft tissues in the tympanic chamber and the tympanic sinus, which is of great reference significance to the diagnosis. In summary, if you suspect that your baby has otitis media, you need to consult a regular hospital in a timely manner, by a professional doctor for standardized diagnosis and treatment, so as not to delay the condition.