Good for you in actively improving your children’s health! However since your children are so young, I don’t think you should follow any dietary advice that people on the internet give you. The doctor who diagnosed them with candida offered no diet suggestions?
If I were you, I would consult a good nutritionist or naturopathic doctor who is familiar with candida and can devise a plan for them. If that’s not feasible for you, I would just keep them on a very healthy diet with whole foods and no sugar, fruit or yeast products.