A nine-month-old baby was found to have a thick discharge in the ear after about 10 days. Initially, the doctor diagnosed it as earwax, but later discovered an increase in earwax, especially in the left ear. After a detailed examination at another hospital, the diagnosis was otitis media, and ear cleaning and otoscopy were performed. The doctor suggested that it might be caused by improper breastfeeding position and recommended hospitalization. Treatment included intravenous azithromycin and ofloxacin, and otoscopy showed fluid accumulation. The fluid did not resolve, and surgery was required. After discharge, the baby took azithromycin orally for 3 days and ear drops three times a day. During follow-up, the doctor found a left ear deformity that might affect hearing. There is now concern about whether the baby’s hearing has been affected.