I did - I tested my son every month or 2 with yoghurt. Apparently yoghurt is milder on them because it is fermented. Once he was 2 he could eat yoghurt - though he still won't touch milk or cheese. He never really developed a taste for it and he's a super picky eater! My daughter's skin is worst on her face and hands/forearms, but it's such an improvement from her entire body covered!