You can't just "decide" to have tubes put in, they aren't a fix all. Take your son to an ENT (Otolaryngologist) and have a hearing test done and an actual exam by the doctor. Does he have a history of ear infections? Does he seem to ignore you when you talk quietly to him? Does he insist that the sound be really loud when he watches TV? These are all questions that you will be asked, watch him so that you will know the answers.
Imagine your ear as a room where your ear drum sits, it reacts to sound like a drum (hence the name ear drum) sending sound waves across 3 bones, the last that is connected to a nerve. What happens when you fill the area around that with fluid? What happens when the area becomes so full of fluid it pushes against the eardrum? THAT is what an ear infection is. Pretty soon the eardrum can't take it any more and it bursts. This scars the eardrum, sometimes so badly it doesn't work properly and has to be replaced. Sometimes there is so much damage that the bones erode and hearing stops all together.
An ENT can pierce the eardrum with a tube that is hollow, it allows the fluid to pass THROUGH the drum, releiving pressure and protecting the fragile inner ear and eardrum. BUT it does leave scarring on the eardrum (which falls out eventually) and you have to be careful not to get water in the ears. Tubes are NOT something to consider lightly. Talk to your ENT and get your son tested. If he has a problem have it corrected, if he doesn't just LOVE on him and let time help solve it.
Once again, our children are not perfect, they walk funny, talk funny, their hair is kinky or straight, they are fat and short. If the speech therapist thinks he is ok and the ENT thinks he is ok then let him be OK! My daughter says Ephelant at 4. It is cute and sweet and I know that before long some kid probably WILL tease her and she will stop and I will miss it when she doesn't say it any more.
Relax, it will be ok.