See his pediatrician
I agree with all of the other answers.
I wanted to add that children
are more prone to ear
infections because of the angle and size of their eustachian tubes. This tube goes from the middle ear (behind the eardrum) to the back of your throat and equalizes the pressure and drains the ear. In children it is shorter, more horizontal and narrower leading to blockage and infection more frequently.
Answer assisted by Chethan Sarabu, Medical Student