I have to reinforce what has already been said by a few others. Ear infections are most often caused by allergies. The body is reacting to an irritant by creating congestion, which gets built up into the ears. Saline sprays several times daily can keep the nasal passages wet to allow drainage, but does not stop the congestion from being created in the first place. My son has severe allergies. Allergic to cow's milk, and soy milk, (plus many other foods) so formula after he was done breastfeeding was not possible. Many, many people are allergic to cow's dairy, soy, wheat, and corn and have no clue because they think being constantly congested is okay (even just a little bit of congestion is not a normal state for the body. These 4 ingredients are in just about everything you buy at a regular grocery store, except the produce section. It takes shopping at a health food store such as Whole Foods to get snacks and cereals without them.)
My 18 month old son's reactions to allergies are either skin rashes and/or congestion. He has had several ear infections, none of which have been treated with antibiotics. I simply take him to the chiropractor for an adjustment. After an adjustment, the congestion literally starts pouring out within the following hour. It is amazing and freaky! I have avoided all drugs except an herbal expectorant that contains guaifenasen and herbal stuff. It is made by Naturade and I find it at Whole Foods and the little health food store close to my home. We are doing NAET allergy treatments and are having great success with them. (Do an internet search to find out more info. on this. It has been very effective for him, and is totally pain-free and relatively inexpensive----much cheaper than a childhood full of drugs, ear tubes, and whatever else they do.)
I have found an MD who has been a great help, Dr. Gilbert Manso. His team is wonderful and will avoid antibiotics if at all possible. You can find him easily on the web. I most often use my naturopath, ND, but her waiting list is a year out, so you can do a search or check with your local health food store to find other naturopaths. Both of these doctors have been a great help in learning what foods to avoid . The naturopath does the NAET treatments and tested my son to find what his allergies were. She has honestly been our lifesaver with my son's allergies! Quite a few chiropractors do NAET also.
Good luck!