My daughter gets ear infections all the time. She now gets what the doctors call swimmers ear. Which sounds a little like what your son has going on. She gets more of a clear liquid that drips out of her ear and crusts over as she sleeps. It is really painful for her and she gets fevers with the infection. The doctors just send me home with antibiotic and ear drops. There really isn’t much you can do about it, but do the best you can. Some kids are just more prone to ear infections then others. The other advice the doctors have given me over the years is not to use normal q-tip in her ears. Either use the baby q-tip or use a piece of toilet paper twisted up. The normal q-tip tends to push the wax build-up into the ear and can actually help in the cause of a later infection. Also, when bathing your son try to keep as much water out of his ears as possible.
Hope this helps or at least makes you not worry so much....S.