Playing with regular play dough is too risky for kids with celiac disease, who can't eat gluten, a protein found in wheat and other grains (and also in most forms of play dough).
Try this recipe instead, which is safe for kids because it uses rice flour and cornstarch (which don't contain gluten).
Mix ingredients. Cook and stir on low heat for 3 minutes or until it forms a ball. Cool completely before storing in a sealable plastic bag.