5-month-old babies always scratching their ears may be related to more cerumen in the ear canal, eczema in the external auditory canal, respiratory tract infections, etc., and need to consult the ENT department of regular hospitals in a timely manner to take targeted treatment. 1. More cerumen in the ear canal: infants with more cerumen in the ear canal or inflammation of the ear canal can cause discomfort in the ear, it is recommended that the cerumen be removed by a professional doctor using professional instruments, parents should avoid pulling out the ear on their own, so as to avoid damaging the child’s ear canal. 2. Eczema of the external auditory canal: Eczema of the external auditory canal will not only appear itching symptoms, but also accompanied by running water and other aspects of the performance of this situation need to be under the guidance of a professional doctor to apply medication, such as erythromycin ointment, glycerine lotion and so on. 3. Respiratory tract infection: If the infant has a respiratory tract infection, it may be complicated by acute otitis media, the symptoms of itching may not be very obvious, but the symptoms of ear pain may be more obvious, and may also be accompanied by running water in the ear. It is necessary to go to the hospital and follow the doctor’s instructions for anti-infection treatment, such as the use of cefixime, amoxicillin and so on. All of the above drugs should be used under the guidance of a doctor, do not self-medication, in order to avoid adverse consequences.