Mesosilver would be the best choice of the two (and in my opinion Mesosilver or Utopia Silver would be the best choices of any silver solutions).
Try this exceptional remedy for earaches (though you may have to use a small cotton ball in the ear if you have problems keeping the toddler still):
Colloidal silver, garlic, tea tree oil, olive oil and apple cider vinegar. Mix together three drops of tea tree oil with a two tablespoons of olive oil, a teaspoon of colloidal silver and a teaspoon of apple cider vinegar. Warm slightly and then lie on your side with your head on a towel (or paper towels) with the infected or aching ear facing up. Use an eyedropper to draw up the mixture and then slowly fill your ear to near the top. Continue to lie on your side for several minutes and the take the towel and hold it to your ear and lie on your other side and let the mixture drain out of your ear onto the towel or paper towels. Repeat two to four times daily. You should experience immediate relief and complete resolution within 24-48 hours. Note: If you do not have all of the ingredients, any combination will probably work. Also, oil of oregano can be substituted for the tea tree oil (but it may sting a bit).
In that case it may be that the internal colloidal silver will help more than the suggested solution to put into the ear. Though the solution will reach the ear drum, most inner ear infections are actually middle ear infections which occur on the backside of the eardrum. How much of the solution might get to the backside of the eardrum is questionable, though as far as I can see it could not hurt and might well help.
For an inner ear infection it is probably best to proceed under the guidance of a medical professional. When such infections are allowed to linger they can result in a ruptured ear drum, such as happened to me when I was seven years old.
I think they are being quite conservative actually - but supplement makers typically list low maintenance/preventive type doses instead of therapeutic short term doses. I note that adults can take 4 or more OUNCES a day over the short term to get rid of infections. I really cannot tell you to exceed what a manufacturer says, but if it were my infant I would give him/her a teaspoon or two several times a day up to perhaps a total of a half ounce or so for the entire day.
After a regimen of antibiotics and a few days of therapeutic amounts of colloidal silver it might be a good idea to give your young one some probiotics to make sure that his internal flora has a good balance of beneficial versus bad flora. You could use a good organic, non-sweetened yogurt with active yeast cultures (you can sweeten it with fruit and/or raw honey). If you get locally grown raw honey a side benefit may be less problems with allergies due to local pollen.
Sounds good to me so far.
Whoever is home during the evening should be able to give him some, hmmm?
I don't see any problem with the milk, You could probably even add some to the milk, but better to just add it to water and let him drink that.
A week is likely all it will take.
Should things take a turn for the worse, which I don't think will happen, get him to a medical professional.
Mesosilver is fine stuff. I like it and Advanced Colloidal Silver about equally as well. I believe that Mesosilver has the smallest average particle size of any silver solutions I know of and the most true colloidal silver content. I think that Advanced Colloidal Silver has the second smallest average particle size and a bit more ionic silver content (about 15% compared to 5% for Mesosilver). However, I am not so sure that having a bit more ionic silver might not be an advantage in some respects. Internally the colloidal silver enters the bloodstream first and then the ionic silver follows and plates to the colloidal silver. Topically, the higher ionic content may also be an advantage since it does not have to enter the bloodstream and it is ultimately the ionic silver which does the work in topical applications. I'd call it a wash and say that you can't go wrong with either of them.
All the best,