Went through the same thing with my younger daughter, we went dairy free for over a year while I was breastfeeding. She is 2.5 years old now and has outgrown it is to a certain extent and is able to have small amounts of dairy a day - usually a piece of cheese. I still don't give either of my girls cows milk as they both have intolerances. My youngest gets diarrhea/eczema (milk protein intolerance) and my oldest gets constipated. I did all my own research on it too, as my family doctor was useless. She called it lactose intolerance when it was really milk protein intolerance. I myself also have dairy intolerance which was really bad when I was a child, and it was really bad after I started introducing dairy again after I finished breastfeeding. But I have built up my tolerance again and can eat it in moderation.