We substituted with rice milk and just knocked out cheese altogether. They didn't like yoghurt to begin with so that was never an issue either. If you do go down that path it might be worth having a chat with a dietician too (your CHN or GP should be able to refer you to one) We have taken out ALL dairy, so anything with even traces of dairy has been removed (for now, to be re-introduced later) thing like biscuits, cake, and some breads all have milk solids in them. You may only need to remove the main dairy, we had to remove it all and are possibly having to remove wheat products as well.