The fluid in the middle ear, especially in children under six, is due a blockage in the Eustachin Tube outflow system. This tube empties excess fluid into the Nasapharynx area but this nasapharynx area in the back of the throat, also allow bacteria to enter into the middle ear, causing ear infections. The sugery this little guy had was to reroute fluid out to the outer ear via the inserted tube. This surgery is used very common in children who have chronic ear infections. Usually children under 6 have eustachin tube that are not at an good downward angle into the nasapharynx area. The steeper angle of the eustachin tube happens when the child starts to have growth spurts and the neck elongates.
Traditional Medince works very well for children in relieving the frequent pain. An other treatment that might be considered is Ear Candling to remove excess wax from the outer ear and evaporating fluid in the middle ear. Ear Candling is also less invasive. I get very good results when I combine the two treatment together.
You might also try gargling with this young one. Start with warm salt water to clean & heal the throat. You might also use a Neti pot each night to clean out the 'germs of the day' from the nasal/throat area. There is also the use of perioxide at half strength gargle: but prepare him for the foam that will result from the perioide.