Hi P.,
I would avoid the surgery at all cost! Perhaps the only thing you need to do is eliminate ALL cow dairy from your baby's diet. I'm a nutritionist and 95% of infants with ear infections benefit from eliminating cow dairy which is the most common allergen.
The reason is that pasteurized cow milk (which is the base for infant formula) contains some very strong allergens which cause an inflammatory reaction resulting in ear infections, skin conditions, asthma, and gastro-intestinal problems. It's incredibly common. Your very best substitute for cow dairy based infant formula is RAW goat milk. If you live in Miami, I have started a Co-op to obtain it from an Amish farm. Read more details about raw dairy and safety for infants here: http://www.rockwellnutrition.com/Millers-Organic-Farm_ep_...
If you are not in Miami, and your health food store does not carry any, you can have it shipped to you from a number of farms around the country: www.realmilk.com/where.html
Your second best alternative if you cannot afford raw goat milk (which by the way lasts 2 weeks in a very cold fridge), is pasteurized goat milk found next to the regular milk at the supermarket. Here's what it looks like:
http://www.meyenberg.com/?action=prod2
However, due to the processing/pasteurization of this milk, it may also aggravate your baby's ears. Yet it's easier for infants to digest and more similar to breast milk.
Lastly, it is critical that you give your baby probiotics aka beneficial bacteria specific for infants. These good bacteria which keep your baby's immune system strong, have all been killed off by the antibiotics. Now, with much of the good flora destroyed and immune system weakened, ear infections can occur more easily. Here is a page of info on infant probiotics:
http://www.rockwellnutrition.com/HLC-Neonate-Powder-by-Ph...
You should also read about homeopathic remedies for ear infections. They are the safest way to treat them in infants, and proven effective in numerous scientific trials over the years. The best known one is Otoplex.
http://www.rockwellnutrition.com/Oto-Plex-by-Weber-Weber_...
In brief, if you do not address the underlying cause of her ear infections by removing allergens and building up her immune system, the surgery will only cause her unnecessary trauma since infections will continue to happen and your baby's health will always suffer in one area or another. The reoccurring ear infections are a sign that "something is wrong" and causing them. The tubes are not a permanent solution. They may not even work at all.
I highly encourage you to try removing all cow dairy in her diet for at least 3 months and supplementing with probiotics. Side note, do not use soy milk. It is a poison for babies and linked to some horrible health problems. You can read more about dangers of soy for infants and kids here:
http://www.westonaprice.org/soy/infant.html
Let me know what you decide to do and how she does!
A. R., CN