What kinds of natural treatments have you tried? Have you read everything on this forum? I just got rid of an external ear infection using one cup of water and one drop of pure oregano oil dropped into ear throughout the day. I used to get tons of ear infections when I was little, until I grew up and stopped drinking milk and improved my diet.
The problem is that your child's ear's keep filling up with fluid and pus for some reason. Find out what that reason is and you're all set. Putting tubes in ears is not a cure. The ear infections are a symptom, why treat symptoms rather than address the cause of a condition?