We had lots of ear infections. I quit using the amox and started using garlic drops. That's a natural antibiotic and it doesn't kill gut flora. Or you can make some. 1/4 cup olive oil. dice a clove of garlic finely, put in olive and let set for several hours. Put a couple of drops in each ear.
Also, after giving antibiotics please give your child some yogurt to help heal the gut from the drugs.
Docs will tell you nursing causes ear infections. Maybe it does. So does vaccinations, esp. DPT, but they don't tell you that.