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.