My son also had ear infections and vomitting until he was diagnosed with milk allergy--- the emergency room doctor told me that it is very common for babes with ear infections to be lactose intolerant. My son was also breastfed. I had to take dairy out of his diet as well as my own in order to treat him. Once dairy was out of our diets he never had another ear infection. He got dairy accidentally once tho when I gave him tofurella cheese which contains caesin---milk protien powder--and had a very bad reaction to it.....If you do try to eliminate dairy, watch out for caesin as it is hidden on many labels and not called milk protien powder even tho that's what it is......Also, now that my son is older, 7, he can now eat dairy products---he outgrew the allergy!! Good luck!!!