You've gotten a lot of replys already, but I remember reading about milk allergies, so I googled this and found the following info. I would prefer to do these first before surgery or multiple antibiotic courses.
Preventive Care (from Mother Nature.com)
Don't smoke around your child. Studies show that the children of smokers have more colds and ear infections than children of nonsmokers. ''If you smoke, the best thing you can do for your child is to quit. But if you don't quit, at least smoke outside. Don't smoke around your child,'' Dr. Macknin says.
Breastfeed your baby. Breastfeeding provides a protective benefit, because anitbodies passed along in the breast milk may decrease your baby's chance of getting an infection, notes Dr. Bluestone. There also seems to be something in mother's milk that helps prevent bacteria from sticking to the mucous membrane of the throat, making it less likely that germs will travel up the eustachian tube into the ear, he says. ''If you want to help prevent ear infections, you should breastfeed your baby for at least the first six months,'' Dr. Bluestone advises.
Feed baby in an upright position. When you bottlefeed or nurse your baby, keep his body in an upright position, especially if he tends to regurgitate a bit of his meal. ''If your baby is in a horizontal position while feeding, regurgitated milk can pass into the eustachian tube, and possibly cause an infection,'' says Dr. Zahtz. This is less likely to happen if you hold your baby at an angle of 45 degrees or more while feeding, he says.
Consider a babysitter instead of day care. Babies under one year old are especially vulnerable to the many viruses in a day-care environment, according to Dr. Bluestone. As a result, they end up with more ear infections than children who are cared for at home, he says. If possible, consider delaying day care until your child is past this critical age.
Ask the doctor about milk allergy. In rare cases, recurrent ear infections may be due to milk allergy, says Dr. Zahtz. ''If a child with chronic infections is less than a year old, I try taking him off all milk products for four weeks to see what develops.'' Don't make any diet changes without talking to your doctor first, though, advises Dr. Zahtz, or you could seriously compromise your child's health.
Watch for early signs of sinus infection. If your child has a cold, and the nasal mucus starts to thicken and become colored, consult a doctor. Thick yellow or green mucus may indicate a sinus infection that needs to be treated with antibiotics, says Dr. Zahtz. If the problem is treated early, there is a good chance that it won't lead to an ear infection, he says.