Ceramic molds are safe for children when used with proper adult supervision, according to eBay Guides. Some molds are more complicated than others, so as a child grows, some molds may be more appropriate for their development.
Ceramic molds are commonly made out of plaster and are meant to be used with liquid clay slip, according the Big Ceramic Store. However, there are also ceramic molds that are appropriate for even the littlest creators, such as making basic dough prints of children's hands and feet, as described in eBay's "Child Friendly Ways to Create Ceramic Molds". Children should wear gloves and safety glasses to help protect their skin and eyes while they're working.